1.The oldest living primates are____?

2.It is not possible for one speciesto evolve into two new species without____?

3.A _____ factor is something that keeps the size of a population down

4.Fourteen beavers live in a pond with an area of 2 square kilometers. What is the population density of the beavers?

5.Darwin explained the similiarity of structures among living organisms by the concept of______?

6.A genetic change will be maintained in a population if the change____

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