When considering the Earth as a magnet, it is important to remember that the Earth
south pole, and that the magnetic south is near Earth's geographical north poler
True or false

Answer:

It can be found on every continent. It was even found growing on weathered granite in Antarctica!

Explanation:

B. the dried blood can still produce nuclear DNA after 20 years. Option B is more correct. Nuclear DNA can be extracted from decades-old dried bloodstains, although the quality and quantity may be lower than new samples.

Option A is inaccurate. Depending on storage and other variables, dried bloodstains from several decades ago can provide useable DNA.

Option C, - forensic experts may also consider. It may not be worth the time and money to examine minor bloodstains or degraded DNA.

Based on the facts supplied, option D, seems unlikely. The bloodstains may belong to the victim or another criminal.

In conclusion, forensic experts would likely examine the bloodstains' age, condition, and amount when choosing whether to analyse them for a suspect match. They may also assess the cost, time, and investigation value of the analysis.

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Answer:

A) artificial selection

Some cells in the body have special jobs they are really good at doing. They are called specialized cells.

The human body has lots of tiny cells, and each of them is different and has a special job to do.  This group helps with important things needed to survive.

One type of cells carry oxygen and another type send electrical signals in our body. Specialized cells help the body do important things. Tissues: Groups of similar cells form tissues, such as muscle tissue, connective tissue, and epithelial tissue.

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Farming is a highly efficient process of crop and animal production over an area of land than hunting and gathering which results in wastage of resources.

Farming is the process of rearing animals or cultivation of crops in an area of land by a farmer.

On the other hand, hunting and gathering refers to the primitive method of hunting of animals and gathering of foods and fruits found in area of land.

There are many advantages of farming an area over hunting and gathering that same area of land. They include:

In conclusion, the process of farming is a careful systematic process while hunting and gathering is left to chance.

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Answer:

that the phage DNA degraded over time.

Explanation:

Answer:

Explanation:

Basically, scientists have learned that rocks are stacked in layers containing fossils with the oldest fossils at the deepest layers, and the youngest, or most recent fossils, near the top. It's as if rock layers are a vertical timeline. At the bottom of the timeline there are no fossils of modern animals.

Answer:

B

Explanation:

Answer:

Plant reproduction is the development of new offspring that can be achieved through sexual or asexual reproduction in plants. By the fusion of gametes, sexual reproduction creates embryos, resulting in offspring genetically distinct from the parent or parents. Asexual reproduction creates new individuals, genetically similar to the parent plants, without the fusion of gametes.

Explanation:

Steps of Double Fertilization.

1. Germination of pollen on stigma :

(i) By absorbing secretion of stigma pollen swells up and outer layer exine ruptures whereas inner lintine comes out in the form of pollen tube.

(ii) Branched polen tube is formed in amentiferae group.

(iii) In families malvaceae, cucurbitaceae, etc. polysiphonous condition (many pollen tubes from a single pollen) is found.

2. Path taken up by pollen tube :

(i) Pollen tube pierces through stigmatic papilla into the tissue of style.

(ii) Filiform apparatus of synergids secrete some chemotropically active substances, which promotes porogamy.

(iii) Obturator (special structure) act as a bridge for growth of pollen tube.

(iv) Cations are naturally occurring chemotropic agents in the pistil.

3. Entry of pollen tube into embryo sac :

(i) It enters into the ovule by either of the two methods; porogamy, chalazogamy or mesogamy.

(ii) Irrespective of the mode of entry of pollen tube into the ovule, the pollen tube always enters into embryo sac at micropylar end (Porogany).

(iii) If enters through chalaza (base) it is termed chalazogany.

(iv) If pierces through integuments, it is called mesogamy.

(v) Tip of pollen tube penetrates embryo sac and reaches egg apparatus.

4. Syngamy (Generative fertilization)

(i) Pollen tube burst as tube nucleus disorganises.

(ii) One of male gametes fuses with egg cell or oosphere.

(iii) Deploid oospore or zygote is formed.

5. Triple fusion (Vegetative fertilization) :

The other gamete fuses with secondary nucleus forming triploid primary endosperm (PEN) which later give rise to endosperm.

Answer:

Double fertilization is a process unique to flowering plants (angiosperms) in which two sperm cells fertilize two different structures within the female reproductive system. The steps of double fertilization are:

Double fertilization leads to the formation of both the embryo and endosperm within the ovule, which ultimately results in the development of a seed.

Lacy wants to design an experiment that will show ovary part of a tomato flower grows into the tomato fruit.

The female reproductive organ present in flowering plants is the ovary. It is present in the flower's gynoecium. It is a portion of the pistil that holds the ovules and is located near the base of the sepals and petals. A single carpel or numerous carpels joined together can form the pistil.

Ovaries, as we know, are an essential component of the plant's female reproductive system. Well, the ovaries are where pollen is kept before developing into ovules and ultimately seeds. These seeds then germinate, causing the ovaries to grow and convert into fruits.

Even though the blooms are self-fertile, the pollen is nevertheless moved to the female half of the blossom by wind and the buzzing of bees' wings. The young tomato grows after fertilization, when the petals and stamens fall off.

So, Lacy will show ovary part of a tomato flower grows into the tomato fruit.

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Explanation:

RNA growth is always in the 5′ → 3′ direction: in other words, nucleotides are always added at a 3′ growing tip, . Because of the ANTIPARALLEL nature of the nucleotide pairing, the fact that RNA is synthesized 5′ → 3′ means that the template strand must be oriented 3′ → 5′.

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Answer:

Botany, Zoology and Microbiology

Explanation:

These are the main studies/branches of Biology.

Answer:

The nucleus stores DNA.

NADH is produced during cellular respiration through the oxidation of glucose in glycolysis and the citric acid cycle.

Glucose is broken down into pyruvate in glycolysis, and NAD+ is reduced to NADH. Pyruvate is then converted to acetyl-CoA in the transition reaction, and NAD+ is again reduced to NADH. It produces one NADH molecule per pyruvate molecule.

In the citric acid cycle, acetyl-CoA is oxidized to carbon dioxide, and NAD+ is reduced to NADH. These molecules are used to produce ATP, the energy currency of the cell, through the electron transport chain.

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The type of reaction can be deduced from observing the changes  in the reaction from left to right.

In the first case, we can see that the aluminium atom replaced Ga from left to right to yield AlP. This reaction is a single replacement reaction.

In the second case, we can see that the two species combined together to yield a single product. Hence, it is a combination reaction.

In the third reaction, We can see that the anions in MgO and BeSe exchanged cation partners from left to right. This means that this is a double replacement reaction.

In the fourth reaction, we can see that methane reacts with oxygen. This is a combustion reaction.

In the fifth reaction, we can see that the NaCl was broken up into its  components. This is a decomposition reaction.

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Answer:

1. Al + + GaP → Ga + AlP - Single Replacement

2. 2 Mg + O2 → 2 MgO - Synthesis

3. MgO + BeSe → BeO + MgSe - Double Replacement

4. CH4 + 2O2 → CO2 + 2H2O - Combustion

5. 2 NaCl → Na + Cl2 - Decomposition

Answer: Fibro cartilage and elastic cartilage

Explanation:Fibrocartilage is what its name sounds like: tough cartilage made of thick fibers. It’s the strongest and least flexible of the three types.Elastic cartilage is your most flexible cartilage. It supports parts of your body that need to bend and move to function.

In most of the single celled organisms like fungus, spyroghyra, etc, reproduction occurs asexually.

The statement best describing a reliable source of information is:A source that follows the scientific method.

A reliable source of information is one that follows the scientific method. The scientific method is a systematic approach to investigating phenomena, which involves formulating a hypothesis, conducting experiments or observations, collecting data, and drawing conclusions based on evidence. By adhering to the scientific method, a source ensures that its information is based on rigorous and objective analysis.

A reliable source of information focuses on providing evidence to support its claims rather than relying on opinions. It presents data, facts, and research findings obtained through scientific studies or credible sources. This evidence-based approach adds credibility to the information presented and allows readers to evaluate the validity of the claims.

On the other hand, a source that includes opinions to support a claim may lack objectivity and can introduce bias into the information. Opinions alone do not necessarily provide a reliable basis for making informed judgments or decisions.

A reliable source also avoids the use of pseudoscience to gather evidence. Pseudoscience refers to claims or practices that are presented as scientific but lack the rigorous scientific methods and evidence required for validation. Such sources often promote ideas that are not supported by credible scientific research and can mislead readers.

In summary, a reliable source of information is one that follows the scientific method, presents evidence to support claims, avoids relying solely on opinions, and does not use pseudoscience to gather evidence. By adhering to these principles, a source can provide trustworthy and accurate information to its audience.

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Answer:

a) All the offspring produced would be a heterozygous in the first generation (F1 generation) with genotype: Ww, Ww, Ww, and Ww. Since wire hair is dominant, all would be wired haired.

b) In the F2 (second generation), we breed the heterozygous offspring from the F1 generation together (Ww x Ww). This will produce 3:1 ratio of dominant:recessive phenotypes having 3/4 of the offspring wire-haired (1/4 WW homozygotes and 1/2 Ww heterozygotes) and 1/4 will be smooth-haired (ww). Also the genotype would have the ratio 1:2:1 (i.e 1 homozygote WW, 2 heterozygote Ww and 1 smooth hair)

c) the chances of producing a smooth-haired pup is 1/4, and the chances of producing a wire-haired pup are 3/4.

d) Therefore, 1/2 of the offspring will have the genotype Ww and be wire-haired, and 1/2 of the offspring will be ww and be smooth-haired.  Also the phenotype ratio is 1:1 (1/2 is heterozygote wired hair and 1/2 is smoth haired)

Explanation:

Since the wire hair is the dominant gene (W) and smooth hair (w) is the recessive allele

a)  If a homozygous wire-haired dog is mated with a smooth-haired dog, All the offspring produced would be a heterozygous in the first generation (F1 generation) with genotype: Ww, Ww, Ww, and Ww. Since wire hair is dominant, all would be wired haired.

b) In the F2 (second generation), we breed the heterozygous offspring from the F1 generation together (Ww x Ww). This will produce 3:1 ratio of dominant:recessive phenotypes having 3/4 of the offspring wire-haired (1/4 WW homozygotes and 1/2 Ww heterozygotes) and 1/4 will be smooth-haired (ww). Also the genotype would have the ratio 1:2:1 (i.e 1 homozygote WW, 2 heterozygote Ww and 1 smooth hair)

c) If two wire-haired dogs produce a smooth-haired pup, that means that both parents must be heterozygotes (Ww) having a pair of dominant W allele and recessive w allele to pass on to the offspring. Therefore, if these two dogs were to mate again (Ww x Ww), the chances of producing a smooth-haired pup is 1/4, and the chances of producing a wire-haired pup are 3/4.

d) If the mother of the wire-haired male was smooth-haired, that means that the recessive allele w had been passed on to the male making the male a   heterozygote (Ww). When this male mates with a smooth-haired female (ww), the cross is Ww x ww. Therefore, 1/2 of the offspring will have the genotype Ww and be wire-haired, and 1/2 of the offspring will be ww and be smooth-haired.  Also the phenotype ratio is 1:1 (1/2 is heterozygote wired hair and 1/2 is smoth haired)

Answer and Explanation:

1. Transform

2. Convergent

3. Divergent

Sorry, it took me a while to add this but my mum wanted me for something..

Sustainable living is the attempt to reduce the use of natural resources like fossil fuels, forests, and others by the human society so that these resources remain available for future generation.

It is associated with maintaining the balance in the ecological, economical and societal needs to lead a healthy lifestyle. As it mainly emphasizes over the protection of the environment then it is also called as green living.

An individual  who pursues a lifestyle where he/she is concerned of using the resources in a limited quantity so the basic requirement of his/her is fulfilled along with preserving the remaining resources for the coming generation so that their basic requirements could be met, is following a sustainable living.

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When we see the reciprocal cross between a red-eyed female (homozygous) and a white-eyed male,we observe that none of the offspring will have white eyes. Additionally, the sex of the offspring will be half male and half female since the ratio of males to females is 1:1.

The reciprocal cross for a red-eyed female (homozygous) and a white-eyed male can be shown as follows:Female (XrXr) x Male (XwY). Females have two X chromosomes and males have an X and a Y chromosome. Red eyes are dominant to white eyes; therefore, we use Xr to represent red eyes and Xw to represent white eyes.

The offspring are as follows:All F1 females are heterozygous (XrXw).All F1 males are hemizygous (XrY).The F1 generation will have red eyes since the dominant allele is present.

None of the F1 individuals will have white eyes as the recessive allele is not present in the F1 generation.

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Cytosine, a nitrogenous base found in DNA and RNA, pairs with guanine. The correct answer is option B.

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Cytosine pairs with Guanine.

The base Cytosine pairs with the base Guanine in DNA. This base pairing is a key component of the double-stranded DNA structure.

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Answer:

flora tge new born is beutiful

The description of the organism corresponds to a Euglena, which is a unicellular living being that's present in freshwater. It is mostly green and has a red pigment spot that helps it to sense light.

Answer:

basic

Explanation:

ph value 9 base is ph value is 9and 20

Answer:

A nutrient is a substance or a chemical compound required by the animal for these productive purposes .

Explanation:

Nutrients are essential compounds and macromolecules needed for a variety of metabolic processes.  Animals show heterotrophic nutrition by consuming organic matter like lipids, fats, and proteins.

Food provides essential vitamins, amino acids and minerals that are used as cofactors and coenzymes in chemical reactions.

For example, animals use carbohydrates as fuel for all metabolic processes.

C6H12O6+ 6 O2 → 6 CO2 + 6 H2O + ≅38 ATP

Answer:

a). At least one intron must be present in gene X.

b). At least two intron must be present in gene Y

c). It is impossible to determine whether there are any introns in gene Z.

Explanation:

Introns may be defined as the segments in the RNA molecule or the DNA molecule that does not code for proteins and they interrupts the sequences of each of the molecules.

In the context, we get :

a). In the gene X, at least one of the intron is present. Sometimes more than one introns may also be present. Due to slicing, we get one band less in the cDNA which is made from the mRNA.

b). In dene Y, at least one intron is present. Sometimes more than one introns are present inside the gene Y. In this case we get two bands less in the gene due to slicing.

c). In gene Z, it is not possible to determine the number of introns present in them. In genes X and Y, the Haelll enzyme is present in the intron. Therefore we get less of band after splicing the mRNA to cDNA.