Which of these would have the least effect on natural selection in a subspecies of giraffes that is geographically isolated from other subspecies of giraffe

A small population of chimpanzees lives in a habitat that undergoes no changes for a long period. How will genetic drift probably affect this population?

Which of these best illustrates natural selection?

A species of finch has been studied on one of the geographically isolated Galapagos Islands for many years. Since the island is small, the lineage of every bird for several generations is known. This allows a family tree of each bird to be developed.

Earth has undergone some catastrophic changes from time to time. Which of these most likely explains why life on Earth continued following these catastrophes?

A small portion of a population that is geographically isolated from the rest of the population runs the risk of decreased

A single species of squirrel evolved over time into two species, each on opposite sides of the Grand Canyon. This change was most likely due to

Fossil evidence suggests that a number of members of one fish species from an ancient lake in Death Valley, California, became several isolated species. Each of these new species lived in a different pond. Which of the following best explains the cau

If a paleontologist finds fossils of many different species existing in the same area at approximately the same time, the paleontologist can conclude that the ecosystem in this area had a high degree of

The scientist who published the booh Origin of Species and proposed the theory of natural selection was

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