They are the “last trophic level” in some hierarchies because they feed on everything (National Geographic). However, according to the strict trophic level definition they would be primary consumers
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the lungs take in oxygen into the body and the blood distributes oxygen to cells throughout the body
It benefitted land plants by basically reproducing onto other areas
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Biotechnology greatly improved biodiversity. For example, Genetic modification produces genetically modified animals, plants and organisms. If they are introduced into the environment they can affect biodiversity. For example, existing species can be overrun by more dominant new species. Assessing the impact on biodiversity requires knowledge.