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variation due to the small differences in the genes that control each feature and characteristic of an individual organism within a species.
the breakdown of food into smaller pieces by chewing and peristalsis.
the movement of respiratory gases across a respiratory surface.
organelles that only occur in the green parts of plants. They contain the green pigment...
(also called secondary thickening) growth due to new cells being formed by the secondary...
stage of photosynthesis that does not require light energy to occur.