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small, non-pigmented plastids that occur in roots and non-photosynthetic tissues of plants. They often occur in cells that store food.
(also called secondary thickening) growth due to new cells being formed by the secondary...
sac-like organelles that contain hydrolytic enzymes.
the protective layer of fibrous connective tissue which surrounds each kidney.
small air-filled sac-like structures from which the lungs are made
produced, growing, living, or occurring naturally in a particular region or environment.