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a timespan in the Earth's history. The sub-division of an era.
the breakdown of food into smaller pieces by chewing and peristalsis.
the U-shaped part of the nephron tubule situated between the proximal and distal convoluted...
series of interlinked food chains by which energy circulates within an ecosystem.
a relationship between two different organisms, of different species, from which at least one of...
a small finger-like projection found on the inner folds of the small intestine, which increases...