Answer: corals, crabs, oysters and urchins
Explanation:
Electrons are subatomic particles that orbit around an atom. This electrons can be shared with other atoms when two atoms are willing to bind with eachother.
Answer: Electron.
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The main reason for the species extinction is for the ecological changes.
A) Crossing over is the mechanism of genetic variation that results from the exchange of gene segments between non-sister chomatids.
