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animals that lack a cavity between the digestive tract and the outer body wall.
tissue that covers the surfaces of the body (the skin) and lines the ducts of the gut.
the process whereby nutrients that have been absorbed from the digestive system are taken up by...
an extreme shortage of food over a large area which affects a large number of people.
the breaking down of large, complex food particles into smaller, soluble molecules which can be...
mass extinction event of 65 million years ago, in which about 85% of all species on Earth died...