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As a functional unit of nature that includes the community of organisms that grow, reproduce, feed and interact, an ecosystem also includes the nonliving elements of the environment. An ecosystem describes a single environmental and ecological unit or community, whereas a biome, by contrast, tends to be regional and often has several distinct ecosystems within it. An aquatic ocean biome consists of numerous ecosystems like tidal pools, coral reefs and kelp forests.
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One relative of whales was Pakicetus, which lived 50 million years ago. (the group of marine animals that includes dolphins and whales).
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Circulatory and Respiratory Systems
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transfer RNA carries a copy of the DNA base sequence to the cytoplasm
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Mass extincions have occured several times on Earth.
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