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(also called physical digestion) the breaking down of food into smaller pieces using mechanical (physical) means, e.g. chewing and peristalsis.
the process whereby a particular change causes a response which reverses that change.
a method of ordering the age of different fossils, relative to each other, without working out...
all the different ecosystems with their numerous and varied organisms.
meristem that produces a layer of bark on the outer surface of a plant.