Four billion years ago the atmosphere contained which two deadly gases?

Answer:

water

Explanation:

All the O2 gas produced during photosynthesis comes from water.

The O2 gas produced during photosynthesis is derived from water (H2O).

During the light-dependent reactions of photosynthesis, which take place in the thylakoid membranes of chloroplasts, light energy is absorbed by chlorophyll molecules, initiating a series of electron transfer reactions.

These reactions split water molecules into oxygen (O2) and protons (H+), releasing oxygen as a byproduct.

The electrons derived from the water splitting are then used to generate energy-rich molecules like ATP and NADPH, which fuel the light-independent reactions (Calvin cycle) responsible for fixing carbon dioxide and synthesizing glucose.

Overall, photosynthesis is the process by which plants and other photosynthetic organisms convert light energy into chemical energy, releasing oxygen in the process.

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Answer: The specific heat of water is higher than other substances

Explanation:

what is true or false there is no question to answer

Answer:

It is true.

Explanation:

Answer:

B. Study of the mind

Mangroves are coastal ecosystems that provide habitats, food, and protection for various species, supporting the food web.

The mangrove ecosystem is a unique and highly productive coastal habitat characterized by mangrove trees, which are specially adapted to survive in saline environments. Mangroves are typically found in tropical and subtropical regions along sheltered coastlines, estuaries, and intertidal zones.

Mangroves are vital in sustaining the ecosystem by providing various ecological services. One of their significant contributions is their role in the food web or food chain.

They serve as a critical nursery and feeding ground for a diverse range of marine species. The intricate network of roots, known as prop roots, provides habitat, protection, and feeding opportunities for numerous organisms, such as fish, crustaceans, mollusks, and birds.

The mangrove leaves and detritus that fall into the water serve as a source of organic matter and nutrients, fueling the base of the food web. Decomposers and detritivores break down the organic matter, which is then consumed by various organisms.

Small organisms, like zooplankton and small fish, feed on the decomposers and detritivores, becoming prey for larger predators such as fish, birds, and reptiles.

Furthermore, mangroves act as a buffer against coastal erosion and storm surges, protecting shorelines and adjacent habitats. They also contribute to water filtration, nutrient cycling, and carbon sequestration, and provide a habitat for numerous endangered and migratory species.

In summary, the mangrove ecosystem plays a crucial role in sustaining the food web or food chain by providing habitat, nursery areas, and food sources for a diverse array of organisms. Their presence supports the productivity and biodiversity of coastal ecosystems, making them an essential component of coastal environments worldwide.

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An investigation is an example of research.

Research is the process of gathering and analyzing information in order to answer a question or solve a problem. Investigations are a type of research that is typically conducted to gather evidence about a crime or other incident. Investigators may gather evidence through interviews, document reviews, and physical examinations. They may also use scientific techniques, such as DNA testing or fingerprint analysis.

The goal of an investigation is to gather enough evidence to determine what happened and who is responsible. This information can then be used to bring charges against the perpetrator or to take other necessary steps.

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Answer:

There's a change in the DNA sequence

Explanation:

If a mutation occurs in cells that will make gametes by meiosis or during meiosis itself, it can be passed on to offspring and contribute to genetic variability of the population. Mutations are the sole source of genetic variability that can occur in asexual reproduction. But the effects of mutations can vary widely, from being beneficial, to having no effect, to having lethal consequences, and every possibility in between.

Answer: D is the answer

Examples of mechanical wear are rutting and scalping. Mechanical wear is the breaking or loss of a surface caused by physical forces. Wear occurs when heavy equipment or cars are used on the ground surface, leaving behind grooves.

Wear can lead to other problems, such as compacted soil and less water going into the soil. On the other hand, flaking is the loss of dirt, which is usually caused by sharp tools or blades on machines or vehicles. This can result in soil compaction, which may be less fertile or have a different texture or structure than the topsoil due to erosion and other problems.

Furrowing and scalping are two practices that should be considered in land control and preservation, as both can harm soil health, plant growth, and ecosystem functioning.

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To manipulate the factors of interest and understand their effects, researchers can employ several methods. Firstly, obtaining participants' informed consent before the experiment ensures ethical practice. Secondly, summarizing participants' responses using a correlation coefficient helps quantify the relationship between variables. Additionally, holding other factors constant across experimental and control groups allows for isolating the effects of the factors being studied. Lastly, fully debriefing participants after completing the experiment ensures transparency and provides an opportunity to address any concerns or questions they may have.

In research, it is crucial to obtain participants' informed consent as it upholds ethical principles and respects individual autonomy. This ensures that participants are aware of the nature and purpose of the study, potential risks, and their rights. Summarizing participants' responses with a correlation coefficient helps determine the strength and direction of the relationship between variables, providing a quantitative measure of their effects.

By holding other factors constant across experimental and control groups, researchers can isolate the impact of the specific factors of interest, minimizing confounding variables and enhancing the internal validity of the study. Lastly, fully debriefing participants after the experiment allows researchers to provide comprehensive explanations about the purpose of the study, the manipulation of factors, and the overall findings. It also gives participants an opportunity to ask questions, address concerns, and ensure their well-being throughout the research process.

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Answer:

pvp o miedo manco de mierda hijueputa pones sala mi id es 542233308

The soil that is permeable was used Instead of densely packed soil that will not allow water to pass through, I would use concrete.

define permeability ?

Permeability is the capacity of a porous material to transmit a fluid; it is expressed as the velocity with which a fluid of specified viscosity passes through a sample with a certain cross section and thickness under the influence of a given pressure. Permeability is mostly determined by the size and form of the pores in the substance, as well as the size, shape, and packing arrangement of the grains in granular materials such as sedimentary rocks.

The darcy is the standard unit of permeability, which is defined as the flow of one cubic centimetre of fluid (with a viscosity of one centipoise) per second through a sample one square centimetre in cross-sectional area at one atmosphere per centimetre of thickness.

The soil that is permeable was used Instead of densely packed soil that will not allow water to pass through, I would use concrete.

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Answer:

Influence of masks on expiratory particles and flow, and associated wearing suggestions. All types of masks can reduce the front flow, but air leakage in other directions can occur when wearing surgical and handmade masks.

Or pressurized areas to non-pressurized areas.

Answer:

From areas of high concentration to areas of low concentration.

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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Statements 1 and 3 are true, while statements 2 and 4 are false.The first energy transformation in the scenario is chemical energy to kinetic. - True.

The archer converts chemical energy stored in their muscles into kinetic energy when they release the string and propel the arrow forward.From the time the archer draws the bow until the thud is heard, entropy increases in the universe. - False. Entropy is a measure of disorder or randomness in a system. In this scenario, the archer's actions do not necessarily lead to an increase in entropy.

The energy of the arrow at the end of the scenario is equal to the energy exerted by the muscles of the archer. - False. Energy is conserved in a closed system, but some energy is lost as heat and sound during the process. Therefore, the energy of the arrow at the end may be less than the energy exerted by the archer's muscles.

When the arrow sticks into the tree, the original energy has all been used up. - False. Energy is not created or destroyed but rather transformed from one form to another. Some of the initial energy from the archer's muscles is transferred to the arrow's kinetic energy, but it is not entirely used up.In summary, statements 1 and 3 are true, while statements 2 and 4 are false.

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Answer:

24

Explanation:

if you add them all up and times them by 3

If the first cause in a series of effective causes were to disappear, the subsequent causes would be rendered impossible.

The five proofs of Thomas Aquinas can be summed up as follows:

1. The motion we notice in the universe was started by God, who is the First Mover.

2. The effects we see in the universe have God as their primary cause.

3. God maintains the universe's existence.

4. God is the source of the universe's hierarchy of perfections.

5. The intelligence that directs nature is God.

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Answer:

It's estimated that some 4,600 sea turtles are killed by fishing nets and hooks every year in U.S. waters.

Explanation:

Answer:

The estimated amounted of turtles killed are 4,600 a year. The cause are that fisher man leave there nets and hooks out in the ocean. That makes the turtles get trapped or seriously injured.

Explanation:

The formation of multicellular organisms commences with a single-celled zygote, which divides rapidly to form the blastula. Cleavage refers to the rapid, multiple shots of cell division.

Following conception, the baby enters the embryonic stage, a period of radical shift.

This stage lasts from the fifth to the tenth week of pregnancy. During a certain stage, the baby is referred to as an embryo. Several changes take place even during embryonic stage.

The primary distinction between an egg and an embryo is that an embryo is formed after the gametes are fertilized, whereas an egg is extracted from the ovary and stored in a freezer prior to fertilization.

Thus, multicellular organisms begin with a single-celled zygote that divides speedily to form the blastula. Cleavage is a term that refers to rapid, multiple strikes of cell division.

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Answer:2

Explanation:because lk

Answer:

sorry if i get this wrong d. Monitoring

Answer:

A. Mechanical

Explanation:

Answer:

Producers, or autotrophs, make their own organic molecules. Consumers, or heterotrophs, get organic molecules by eating other organisms.

A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another.

In a food chain, each organism occupies a different trophic level, defined by how many energy transfers separate it from the basic input of the chain.

Food webs consist of many interconnected food chains and are more realistic representation of consumption relationships in ecosystems.

Energy transfer between trophic levels is inefficient—with a typical efficiency around 10%. This inefficiency limits the length of food chains.

Introduction

Organisms of different species can interact in many ways. They can compete, or they can be symbionts—longterm partners with a close association. Or, of course, they can do what we so often see in nature programs: one of them can eat the other—chomp! That is, they can form one of the links in a food chain.

In ecology, a food chain is a series of organisms that eat one another so that energy and nutrients flow from one to the next. For example, if you had a hamburger for lunch, you might be part of a food chain that looks like this: grass \rightarrow→right arrow cow \rightarrow→right arrow human. But what if you had lettuce on your hamburger? In that case, you're also part of a food chain that looks like this: lettuce \rightarrow→right arrow human.

As this example illustrates, we can't always fully describe what an organism—such as a human—eats with one linear pathway. For situations like the one above, we may want to use a food web that consists of many intersecting food chains and represents the different things an organism can eat and be eaten by.

In this article, we'll take a closer look at food chains and food webs to see how they represent the flow of energy and nutrients through ecosystems.

Autotrophs vs. heterotrophs

What basic strategies do organisms use to get food? Some organisms, called autotrophs, also known as self-feeders, can make their own food—that is, their own organic compounds—out of simple molecules like carbon dioxide. There are two basic types of autotrophs:

Photoautotrophs, such as plants, use energy from sunlight to make organic compounds—sugars—out of carbon dioxide in photosynthesis. Other examples of photoautotrophs include algae and cyanobacteria.

Chemoautotrophs use energy from chemicals to build organic compounds out of carbon dioxide or similar molecules. This is called chemosynthesis. For instance, there are hydrogen sulfide-oxidizing chemoautotrophic bacteria found in undersea vent communities where no light can reach.

Autotrophs are the foundation of every ecosystem on the planet. That may sound dramatic, but it's no exaggeration! Autotrophs form the base of food chains and food webs, and the energy they capture from light or chemicals sustains all the other organisms in the community. When we're talking about their role in food chains, we can call autotrophs producers.

Heterotrophs, also known as other-feeders, can't capture light or chemical energy to make their own food out of carbon dioxide. Humans are heterotrophs. Instead, heterotrophs get organic molecules by eating other organisms or their byproducts. Animals, fungi, and many bacteria are heterotrophs. When we talk about heterotrophs' role in food chains, we can call them consumers. As we'll see shortly, there are many different kinds of consumers with different ecological roles, from plant-eating insects to meat-eating animals to fungi that feed on debris and wastes.

The onion skin cells doesn't have chloroplasts because the bulb of the onion grows underground.

Chloroplasts produce energy through photosynthesis and oxygen-release processes, which sustain plant growth and crop yield. As such, chloroplasts are responsible for the biosynthesis of active compounds such as amino acids.

The most important function of the chloroplast is to synthesise food by the process of photosynthesis. Absorbs light energy and converts it into chemical energy. Chloroplast has a structure called chlorophyll which functions by trapping the solar energy.

The two main functions of chloroplasts are to produce food (glucose) during photosynthesis, and to store food energy. Most leaves appear green because the chloroplasts in plant cells give plants their green color.

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Based on their recognition sequences, two DNA bands will be produced by Bam1 and three DNA bands will be produced by EcoR1.

Restriction sites are sequences of nucleotides which are recognized by restriction enzymes and are acted upon by the restriction enzymes.

Restriction enzymes cuts DNA at recognition sites based on their recognition sequences.

Examples of restriction enzymes are Bam1 and EcoR1.

For Bam1, the recognition sequence is (CCTAGG) --- 5' CCTAGG 3'

Two bands will be produced using Bam1 as shown below:

5'ACGAATTCAGTATTATCCTAGG 3'

3'TGCTTAAGTCATAATAGGATCC 5'

5'TATCCGCCGCCGAATTCTCATCA 3'

3'ATAGGCGGCGGCTTAAGAGTAGT 5'

For EcoR1, the recognition sequence is (GAATTC) --- 5'GAATTC 3'

Three bands will be produced using with EcoR1 as shown below:

5'ACGAATTC 3'

3'TGCTTAAG 5'

5'AGTATTATCCTAGGTATCCGCCGCC 3'

3'TCATAATAGGATCCATAGGCGGCGG 5'

5'TCATCA 3'

3'AGTAGT 5'

Therefore, two DNA bands will be produced by B-am1 and three DNA bands will be produced by Eco-R1.

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Answer:

pictures of different ecosystems

Explanation:

i got it right

Answer:

Algae would be the organism in greatest proportion in a lake in a national park.

Explanation:

A lake in a national park would have algae proliferation, which would be the largest organism in that lake. This is because a lake in a national park is subjected to great incidence of sunlight and large amounts of oxygen. This would facilitate and stimulate the reproduction of algae on a large scale, causing them to develop in the substrate, stones, pebbles, and in the water itself.

Answer:

Will it be hard to get a good grade in that class?

A. Hypothesis = A hypothesis is making an educated guess made from limited evidence, background information, and observations.