Because a food chain is based on one certain thing in the ecosystem ....if the entire ecosystem was in it it would be a food web which is food chains from an ecosystem linked together
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Frederick Miescher first identified DNA.
DNA provides the instructions for protein production.
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Answer:
During nitrogen fixation specialised bacteria living in the earth's atmosphere convert nitrogen taken from the geosphere
extinct organisms; that is, they belong to species that are no longer living anywhere on Earth. (3) The kinds of fossils found in rocks of different ages differ because life on Earth has changed through time.
