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a molecule that is converted to adenosine triphosphate (ATP) for energy storage.
a liquid-filled body cavity formed within the mesoderm of some animals. The cavity occurs...
many-celled, complex organisms with cell differentiation and specialised tissues performing life...
birds without a keel on their breastbones and therefore unable to fly, for example ostriches....
a biological membrane that separates the interior of all cells from the outside environment.