1. The cells specialize.
A crab has an exoskeleton.
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In the earliest stages of development, all four organisms have a knobby head, gill slits, and a tail. These similarities tell us that all four of these organisms have a common ancestor.
-the number of protons found in an atom of that element
Answer:
i think but not really sure the answer is
an organism, especially a soil bacterium, fungus, or invertebrate, that decomposes organic material.
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The study of early development of organisms is called embryology.
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