The answer is "all of these."

The transfer of energy in ecosystems occurs when organisms consume one another. Energy is transferred from the organism that is consumed to the organism that does the consuming. A food chain is a representation of this, and shows the “chain” of organisms through which nutrients and energy move.

In a food chain, each organism occupies a different trophic level, defined by how many energy transfers separate it from where the chain begins, with “producers” or “autotrophs” at the bottom, collecting energy from the sun. As you move up the food chain, more and more energy is lost to heat and used by organisms so top predators need to consume more prey to get the same amount of energy from the trophic level below them. Food webs consist of many interconnected food chains and are a more realistic representation of consumption relationships in ecosystems.

The answer is "hawk."

The transfer of energy in ecosystems occurs when organisms consume one another. Energy is transferred from the organism that is consumed to the organism that does the consuming. A food chain is a representation of this, and shows the “chain” of organisms through which nutrients and energy move.

In a food chain, each organism occupies a different trophic level, defined by how many energy transfers separate it from where the chain begins, with “producers” or “autotrophs” at the bottom, collecting energy from the sun. As you move up the food chain, more and more energy is lost to heat and used by organisms so top predators need to consume more prey to get the same amount of energy from the trophic level below them. Food webs consist of many interconnected food chains and are a more realistic representation of consumption relationships in ecosystems.

The answer is "an autotroph" because they convert sunlight into chemical energy.

The transfer of energy in ecosystems occurs when organisms consume one another. Energy is transferred from the organism that is consumed to the organism that does the consuming. A food chain is a representation of this, and shows the “chain” of organisms through which nutrients and energy move.

In a food chain, each organism occupies a different trophic level, defined by how many energy transfers separate it from where the chain begins, with “producers” or “autotrophs” at the bottom, collecting energy from the sun. As you move up the food chain, more and more energy is lost to heat and used by organisms so top predators need to consume more prey to get the same amount of energy from the trophic level below them. Food webs consist of many interconnected food chains and are a more realistic representation of consumption relationships in ecosystems.

The answer is "phytoplankton."

The transfer of energy in ecosystems occurs when organisms consume one another. Energy is transferred from the organism that is consumed to the organism that does the consuming. A food chain is a representation of this, and shows the “chain” of organisms through which nutrients and energy move.

In a food chain, each organism occupies a different trophic level, defined by how many energy transfers separate it from where the chain begins, with “producers” or “autotrophs” at the bottom, collecting energy from the sun. As you move up the food chain, more and more energy is lost to heat and used by organisms so top predators need to consume more prey to get the same amount of energy from the trophic level below them. Food webs consist of many interconnected food chains and are a more realistic representation of consumption relationships in ecosystems.

The answer is "predator and a scavenger."

The transfer of energy in ecosystems occurs when organisms consume one another. Energy is transferred from the organism that is consumed to the organism that does the consuming. A food chain is a representation of this, and shows the “chain” of organisms through which nutrients and energy move.

In a food chain, each organism occupies a different trophic level, defined by how many energy transfers separate it from where the chain begins, with “producers” or “autotrophs” at the bottom, collecting energy from the sun. As you move up the food chain, more and more energy is lost to heat and used by organisms so top predators need to consume more prey to get the same amount of energy from the trophic level below them. Food webs consist of many interconnected food chains and are a more realistic representation of consumption relationships in ecosystems.

The answer is "it does not show all the predator/prey relationships like a food web"

The transfer of energy in ecosystems occurs when organisms consume one another. Energy is transferred from the organism that is consumed to the organism that does the consuming. A food chain is a representation of this, and shows the “chain” of organisms through which nutrients and energy move.

In a food chain, each organism occupies a different trophic level, defined by how many energy transfers separate it from where the chain begins, with “producers” or “autotrophs” at the bottom, collecting energy from the sun. As you move up the food chain, more and more energy is lost to heat and used by organisms so top predators need to consume more prey to get the same amount of energy from the trophic level below them. Food webs consist of many interconnected food chains and are a more realistic representation of consumption relationships in ecosystems.

The answer is "It converts radiation energy into chemical energy" because the purpose of a food chain is to illustrate the transfer of energy.

The transfer of energy in ecosystems occurs when organisms consume one another. Energy is transferred from the organism that is consumed to the organism that does the consuming. A food chain is a representation of this, and shows the “chain” of organisms through which nutrients and energy move.

In a food chain, each organism occupies a different trophic level, defined by how many energy transfers separate it from where the chain begins, with “producers” or “autotrophs” at the bottom, collecting energy from the sun. As you move up the food chain, more and more energy is lost to heat and used by organisms so top predators need to consume more prey to get the same amount of energy from the trophic level below them. Food webs consist of many interconnected food chains and are a more realistic representation of consumption relationships in ecosystems.

The answer is "food chain."

The transfer of energy in ecosystems occurs when organisms consume one another. Energy is transferred from the organism that is consumed to the organism that does the consuming. A food chain is a representation of this, and shows the “chain” of organisms through which nutrients and energy move.

In a food chain, each organism occupies a different trophic level, defined by how many energy transfers separate it from where the chain begins, with “producers” or “autotrophs” at the bottom, collecting energy from the sun. As you move up the food chain, more and more energy is lost to heat and used by organisms so top predators need to consume more prey to get the same amount of energy from the trophic level below them. Food webs consist of many interconnected food chains and are a more realistic representation of consumption relationships in ecosystems.

The answer is "Killer Whales" because they are at the top of the food chain, and energy transfer is inefficient. Only about 10% of energy moves from one organism to the next.

The transfer of energy in ecosystems occurs when organisms consume one another. Energy is transferred from the organism that is consumed to the organism that does the consuming. A food chain is a representation of this, and shows the “chain” of organisms through which nutrients and energy move.

In a food chain, each organism occupies a different trophic level, defined by how many energy transfers separate it from where the chain begins, with “producers” or “autotrophs” at the bottom, collecting energy from the sun. As you move up the food chain, more and more energy is lost to heat and used by organisms so top predators need to consume more prey to get the same amount of energy from the trophic level below them. Food webs consist of many interconnected food chains and are a more realistic representation of consumption relationships in ecosystems.

The answer is "nematodes, arthropods, and protozoa."

The transfer of energy in ecosystems occurs when organisms consume one another. Energy is transferred from the organism that is consumed to the organism that does the consuming. A food chain is a representation of this, and shows the “chain” of organisms through which nutrients and energy move.

In a food chain, each organism occupies a different trophic level, defined by how many energy transfers separate it from where the chain begins, with “producers” or “autotrophs” at the bottom, collecting energy from the sun. As you move up the food chain, more and more energy is lost to heat and used by organisms so top predators need to consume more prey to get the same amount of energy from the trophic level below them. Food webs consist of many interconnected food chains and are a more realistic representation of consumption relationships in ecosystems.