why is the kingdom protista no longer considered a valid kingdom
Answers
The kingdom Protista is no longer considered a valid kingdom because it was a polyphyletic group, meaning it did not include all of the descendants of a common ancestor. Instead, it was a catch-all group for eukaryotic organisms that did not fit into the other kingdoms at the time.
Protista was initially established by Ernst Haeckel in the 1860s to include unicellular eukaryotic organisms, such as amoebas and algae, that were not clearly plants or animals. Over time, the kingdom was expanded to include a wide range of organisms, including some multicellular forms like kelp and slime molds. However, it was recognized that this grouping was artificial and didn't reflect true evolutionary relationships among these organisms. Today, scientists use a more detailed and specific classification system based on molecular and genetic evidence. This has led to the recognition of several distinct eukaryotic groups, including the kingdoms Fungi, Plantae, and Animalia, as well as various protist groups.
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Related Questions
With what force would a 4 kg ball hit a wall if it was rolled from a point with an initial velocity of 0 and a final velocity of 10 m/s in 5 s?
Answers
The force with which a 4 kg ball hits a wall is 8 N.
What is the experienced by the ball?The force with which a 4 kg ball hits a wall is calculated by applying Newton's second law of motion as follows;
F = ma
where;
m is the mass of the objecta is the acceleration of the objectacceleration is the change in velocity of object with time;
a = (v - u)/t
where;
v is the final velocityu is the initial velocityt is timeF = m (v - u )/t
F = 4 (10 - 0 ) / 5
F = (40)/5
F = 8 N
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LOTS OF POINTS - SIMPLE QUESTION Why are the atmosphere, biosphere, lithosphere, and hydrosphere all called “Earth’s life-support system”?
Answers
Explanation:
Because these are the living technology of earth.
Answer:
they're all what keeps the earth living
Explanation:
Movement is a characteristic of a living thing. Discuss
Answers
Answer:
All living organisms show movement of one kind or another. All living organisms have internal movement, which means that they have the ability of moving substances from one part of their body to another.
PLZ HELP !!! Place the four images from the cell cycle in the correct chronological order?
Answers
Answer:
the answer to your question C, B, A, D
Is the sympathetic system part of the central or peripheral nervous systems?
Answers
Answer:
yes
Explanation:
what structural features of alveoli make them an ideal place for gas exchange
Answers
The structural features of alveoli make them an ideal place for gas exchange due to their large surface area and thin walls.
Alveoli are tiny, balloon-like structures found in the lungs. They are surrounded by an extensive network of capillaries, where the exchange of gases takes place. The large number of alveoli in the lungs provides a significantly large surface area for gas exchange to occur. This increased surface area allows for a greater amount of oxygen to diffuse into the bloodstream and carbon dioxide to be removed efficiently. Furthermore, the walls of the alveoli are extremely thin, consisting of a single layer of epithelial cells. This thinness enables gases to diffuse quickly across the alveolar membrane. The close proximity of the alveolar walls to the capillaries allows for a short diffusion distance, ensuring a rapid exchange of gases. Overall, the combination of the large surface area and thin walls of alveoli maximizes the efficiency of gas exchange in the lungs, facilitating the uptake of oxygen and the removal of carbon dioxide from the bloodstream. This ensures an adequate oxygen supply for cellular respiration and the elimination of waste gases produced by metabolic processes.
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erythrocytes are known as white red blood cells and are shaped like donuts with dented centers true or false
Answers
The given statement erythrocytes are known as white red blood cells and are shaped like donuts with dented centers is false.
Erythrocytes, which are also known as red blood cells, are actually biconcave discs, meaning they are shaped like a flattened donut with two dented centers.
They are not white, but actually red because they contain a protein called hemoglobin, which binds to oxygen and gives them their color.
Erythrocytes are the most common type of blood cell and are essential for survival. They are produced in the bone marrow and are responsible for carrying oxygen and carbon dioxide between the lungs and other organs of the body.
They also aid in the formation of blood clots, which help to prevent excessive blood loss. Without them, the body would not be able to function normally and could experience serious health problems.
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In the early 1900s, three species of goatsbeard wildflowers, T. dubius, T pratensis, and T. porrifolius, were introduced to the United States. Each of the species had a chromosome number of 2N. In the 1930’s, a few populations of offspring from the original wildflowers were identified as having a chromosome number 4N. What does this data suggest about speciation.
A. Speciation has occurred because the original species of wildflowers produced populations of viable offspring.
B. Speciation has occurred because breeding between the offspring and original populations would not be possible.
C. Speciation has not occurred because the offspring of the original wildflowers were not introduced into a new area.
D. Speciation has not occurred because the offspring inherited identical genetic information to the original wildflowers.
Answers
Answer:
B. Speciation has occurred because breeding between the offspring and original populations would not be possible.
Explanation:
Speciation has occurred in the species due to no breeding between the offspring and original populations because the offspring and original species has different number of chromosomes in their DNA. Due to this difference in the chromosome number in the DNA, there is no chance of breeding between offspring and original species. Speciation is the evolutionary process by which populations of organism evolve with the passage of time and become different from the original species.
Genes are responsible for:
OA.
all traits of an organism.
OB.
all inherited traits of an organism.
OC.
no traits of an organism.
OD.
all preferences of an organism.
Answers
Answer: A) All the traits of an organism
Explanation: Genes are responible for type of hair or hair color, eye color or eye shape, skin tone, body figure, height, and etc.
Consider the cladogram. A cladogram is shown. Roundworms have the derived characteristics of true tissues, bilateral symmetry, and a pseudocoelom. Which group of organisms has the derived characteristics of true tissues, bilateral symmetry, and a pseudocoelom? sponges roundworms annelids chordates
Answers
Answer:
The correct answer is - roundworms.
Explanation:
The answer is already mention in the question, however, the detailed answer is as follows:
The characteristics that are given in the question are true tissues, bilateral symmetry, and a pseudocoelom. Worms or helminths are known as primitive form of organization of the Bilaterians. All three group of worms or helmints have a basic bilateral symmetry.
These organisms inaugurated various characteristic that are found and carried by other animals such as true tissues, bilateral symmetry, and a pseudocoelom.
Thus, the correct answer is - roundworms.
Answer:
its b
Explanation:
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John is testing the effect of temperature on the Solubility of sugar and water he organize data about his experiment in the following table
Answers
10)“If Jupiter was not there, there could be more terrestrial planets”. Explain how
Answers
Answer:
Soler system would not be well
which of the following are represented by upper and lower case letters
A. proteins
B. chromosomes
C. genotypes
D. phenotypes
Answers
Answer: B. Chromosomes
Explanation:
Scientific researchers discovered agents that behaved like bacteria causing diseases such as rabies and hoof-and-mouth, but were much smaller. It became the general view that viruses were biologically "alive." This perception changed in 1935 when the tobacco mosaic virus was crystallized and scientists demonstrated that the particles lacked any mechanisms necessary for metabolic function. It was determined that viruses consisted of a nucleic acid, DNA or RNA, surrounded by a protein shell. Viruses exist in two distinct states. When not in contact with a host cell, the virus remains entirely dormant. During this time there are no biological activities occurring and the virus is nothing more than a static organic particle. Viruses can remain like this for extended periods of time, waiting to come into contact with the appropriate host. When the virus comes into contact with a host, it becomes active, reacts to its environment and/or host and directs its efforts toward self-replication. The viral goal now is to produce more viruses to attack host cells.
The characteristics of life: many are listed in the passage describing viruses. One important piece of evidence arguing against life for viruses is implied by the passage; not stated directly. Viruses are not living, because, as implied by the passage, they
A. Lack a nucleus
B. Have no DNA
C. Are not cellular
D. Do not reproduce
Answers
According to the given passage, viruses are not living because they (C) do not have a cellular organization.
Viruses lack a cellular organization which is a basic feature of all living organisms. A virus is a nucleoprotein, with the genetic material enclosed by a protein coat. The genetic material could be either DNA or RNA. The genetic material is responsible for causing infection in the host.
Viruses are inactive outside their specific host cell. They are non-cellular organisms. They possess an inert crystalline structure outside the living host cell. The protein coat of a virus, i.e. capsid, serves as a protective covering for the genetic material.
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Answer give in Nepali How carbon dioxide is necessary for photosynthesis
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Carbon dioxide is necessary for photosynthesis in plants. It is so necessary because it combines with water to form glucose or carbohydrates which are incredibly important for plants to provide energy. If they were to not take in carbon dioxide, then they would also not give oxygen which is the most essential for humans.
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Neplai Version: बोटहरूमा प्रकाश संश्लेषणको लागि कार्बन डाइअक्साइड आवश्यक हुन्छ। यो यति आवश्यक छ किनभने यसले पानीसँग मिसाएर ग्लुकोज वा कार्बोहाइड्रेट बनाउँछ जुन बोटबिरुवाहरूको लागि शक्ति प्रदान गर्न अविश्वसनीय रूपमा महत्त्वपूर्ण हुन्छ। यदि तिनीहरूले कार्बन डाइअक्साइड लिदैनन् भने तिनीहरूले अक्सिजन पनि दिदैनन् जुन मानवहरूको लागि सबैभन्दा आवश्यक हो।
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what is the function of cellulose in a plant cell?
a strengthening substance for the cell wall
a nutrient to help plants grow
an enzyme used during photosynthesis
a molecule that enhance the green color of a plant
Answers
Answer:
a strengthening substance for the cell wall
Explanation:
Cellulose is a major component of cell walls that and is what makes plant stems, leaves, and branches so strong.
Also, I took the test.
The function of cellulose in a plant cell is a strengthening substance for the cell wall. (Option A)
How does cellulose play this role?Cellulose plays a crucial role in plant cells as a strengthening substance for the cell wall.
It is a complex carbohydrate made up of long chains of glucose molecules, forming a rigid structure.
Cellulose provides structural support to plant cells, allowing them to maintain their shape and resist mechanical stress. It contributes to the rigidity and strength of the cell wall, enabling plants to grow upright and withstand external pressures.
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true/false. today we know much more about nutrients and as a result we are metabolically much healthier than we have ever been.
Answers
The statement " today we know much more about nutrients and as a result, we are metabolically much healthier than we have ever been" is false because as the current prevalence of metabolic diseases suggests otherwise.
While we have made significant progress in understanding nutrients and their roles in our health, the modern diet and lifestyle have also brought about new health challenges.
While we have access to a wider variety of foods and supplements that can provide us with the nutrients we need, we also face new challenges such as an overabundance of calorie-dense, nutrient-poor foods and sedentary lifestyles.
Additionally, some people may have genetic or health conditions that affect their ability to absorb and utilize nutrients properly, which can lead to deficiencies or other health issues.
Overall, while we have made progress in understanding nutrients and their importance, it is important to maintain a balanced diet and lifestyle to achieve optimal health. Therefore, the statement is false.
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Differentiate between subsistence farming and commercial farming .
only 2 points:)
Answers
Answer:
Difference between subsistence farming and commercial farming
Explanation:
Subsistence farming is done basically to feed the farmers family itself. It has little or no profit.
Commercial farming is done with the intent of profit, where cash crops are sown.
The myocardial mantle is already capable of contractions in stage 10 (4 weeks) = because . = contractile elements have formed very early. ====-- Choose the best answer. 1. Both statements are true and the causal relationship is correct. 2. Both statements are true, but the causal relationship is false. 3. The first statement is right, but the second one is false. 4. The first statement is false, but the second one is true, 5. Both statements are false.
Answers
The myocardial mantle is already capable of contractions in stage 10 (4 weeks) = because. = Contractile elements have formed very early.
The best answer is 1. Both statements are true and the causal relationship is correct.
This statement is true because the myocardial mantle, which is the outer layer of the heart tube formed during embryonic development, does indeed possess contractile elements.
Furthermore, the statement suggests that the reason for the myocardial mantle's capability of contractions at this stage is the early formation of contractile elements.
This causal relationship is also correct. During early embryonic development, specialized cells differentiate into cardiomyocytes, which are responsible for the contractions of the heart.
These cardiomyocytes contain contractile proteins, such as actin and myosin, which enable them to contract and generate force.
Therefore, both statements in the given statement are true, and the causal relationship between the early formation of contractile elements and the myocardial mantle's ability to contract is correct. Therefore, the correct answer is 1.
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Question
The myocardial mantle is already capable of contractions in stage 10 (4 weeks) = because . = Contractile elements have formed very early. ====-- Choose the best answer.
1. Both statements are true and the causal relationship is correct.
2. Both statements are true, but the causal relationship is false.
3. The first statement is right, but the second one is false.
4. The first statement is false, but the second one is true,
5. Both statements are false.
Select the correct text in the passage.
Select the sentence that states an adaptation shown by the animals in the bathypelagic zone.
The bathypelagic zone spans from one to four thousand meters in depth. It is called the midnight zone, as there is total abs
Marine animals in this zone survive on the dead and decaying organic matter sinking from the upper zones. This matter is
detritus. They also prey on other animals. They have large mouths, sharp teeth, and flexible stomachs to accommodate la
Reset
Next
Answers
Answer:
marine animals in this zone survive on the dead and decaying organic matter sinking from the upper zones. this matter is deritus.
Explanation:
Answer:
They have large mouths, sharp teeth, and flexible stomachs to accommodate...
Explanation:
plato
A scientist wants to determine the age of a rock. The rock contains an index fossil and an ancient relative of a living organism. Which is more useful for dating the rock, and why?
Answers
An index fossil will be more useful in dating the rock than ancient relative because carbon dating can be performed using the fossil which will give more accurate details rather than the relative dating performed using ancient relative.
Index fossil is any preserved remains of the plant or animal that is particularly useful for the dating purposes. It is useful for determining the geological periods. Most of the rocks that contain the index fossil are found in marine environment.
Carbon dating is the process of determining the age of ancient objects or fossils. In this the amount of radioactive carbon is measured as the rest forms of carbons stop being absorbed but radioactive carbon continues to decay even after an organism dies.
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Which statement is FALSE about the Cell Cycle? Question 4 options:
A. During Prophase, the cell fully splits into a parent and a daughter cell.
B. Most of the cell's life is spent in Interphase, growing larger.
C. The stages of the cell cycle repeat themselves.
D. The cytoplasm divides during the process called cytokinesis.
Answers
Answer:
the answer is A since the cell splits into two only during the cytokinesis
Answer: I belive its A
Explanation:
Define Metabolism.. !
Answers
Answer:
Metabolisms are the chemical processes that occur within a living organism in order to maintain life
Explanation:
The higher the beanbag rises, the greater the
Answers
Answer:
Kinetic energy??
Explanation:
Question 2 of 10
A biologist measures the allele frequencies of pea plants in a very controlled
environment. The plants can either have a dominant tall allele (7) or a
recessive short allele (t). Which of the following would be a reason that this
population is not at Hardy-Weinberg equilibrium?
A. There are no mutations in the alleles for height.
OB. Tall plants are more likely to survive.
C. The pea flowers are pollinated at random.
OD. All of the pea plants reproduce exactly once.
Answers
Answer: The Hardy- Weinberg theory states that frequencis of alleles and genotypes will remain constant from generations to generationss without the evolutionary influences. From your choices, the three supports the Hardy- Weinberg equilibrim but letter C does not. There must be no new allele to be produced fro the mutation of the pea plant.
Explanation:
i hope this helps
List the functions of proteins in the text area below.
Which statement about nucleic acids is true?
Check all that apply.
Nucleic acids store and transmit genetic information.
The nucleic acid DNA is the blueprint for life.
DNA holds the instructions for all structures and functions of an organism.
The nucleic acid RNA “reads” the instructions from DNA to construct proteins
Answers
Answer:
functions of protein:
growth and maintainance
causes biochemical reactions
acts as a messenger
provides structure
transports and stores nutrients
provides energy
Explanation:
all the statements about nucleic acids are true
An__ is a variation of a gene For example.
Answers
www.freeanswers.com
Answer:
Genetic variation
Explanation:
Genetic variation refers to diversity in gene frequencies.
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8. Compare the number of protons and electrons in a neutral atom
Answers
Answer:
The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.
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Prokaryotes are structurally simple organisms that have existed for over two billion years.
Which of the following are prokaryotes?
Choose 1 answer:
(Choice A)
A
Animals
(Choice B)
B
Plants
(Choice C)
C
Fungi
(Choice D)
D
Bacteria
Answers
Only the single-celled organisms of the domains Bacteria and Archaea are classified as prokaryotes—pro means before and kary means nucleus. Animals, plants, fungi, and protists are all eukaryotes—eu means true—and are made up of eukaryotic cells.
Answer:
the bacteria
bacterium are prokaryotes which are single-celled and their nuclear material and not enclosed in a nuclear membrane
Which electrical signal can allow for rapid long-distance communication within the nervous system?
Answers
Answer:
Which electrical signal can allow for rapid long-distance communication within the nervous system?
nerve action potential