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a single cell resulting from the fusion of two gametes.
dormant, tough and non-reproductive structure that remains dormant until conditions become...
teeth found at the back of the mouth just in front of the molars in the mammalian jaw, used for...
outer body tissue layer that forms the epithelium and nervous tissue.
the internal supporting framework made of cartilage and/or bone. This type of skeleton occurs in...
all the different ecosystems with their numerous and varied organisms.