How would the extinction of osprey affect the eagles, the fish, and small fish in the near future. 

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

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the answer would be   10%

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.