Place the following steps of allopatric speciation in their correct order:
A. A flood causes a physical barrier down the middle of a population.
B. A population covers a large area.
C. The two separate populations evolve differently and form new species.
D. When the water recedes, the two new species do not mate.
1. first event
2. second event
3. third event
4. fourth event
ANS:1.
B
2. A
3. C
4. D
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