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the immunity an organism develops during its lifetime.
the cylinder of parenchyma found from the centre of the stem to the inside of the vascular...
cells that are formed during secondary growth by the vascular cambium ring just to the inside of...
animals that lack a cavity between the digestive tract and the outer body wall.
the main blood vessel that returns deoxygenated blood from the head and thorax to the right...
(also called autotrophic organisms) organisms that produce their own organic food, mainly...