What is required for sympathetic speciation to occur? A. Continuous gene flow populations'
B. Geographic separation of a population
C. Emergence of a reproductive barrier
D. A limited separation of members of a population, followed by reintroduction back into the parent population​

I'm no biology teacher but I think its C im in 8th grade and did this last year i believe(:

Explanation:

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the answer is cell division : )

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.