Adaptation to terrestrial life required major evolutionary changes including the change from gill breathing to lung breathing was accompanied by important changes in the cardiovascular system.
A terrestrial life includes living of animals and plants on both land as well as on the sea instead of just in water or climbing on trees. Examples of animals include cats, ants, dogs, kangaroos, elephants, etc. and plants include trees, shrubs, vines, grasses and herbaceous plants.
The cardiovascular system is combined of the heart, blood vessels, and blood. It pumps blood from the heart to the lungs to get oxygen and than to all parts of the body.
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