AP BIOLOGY

Detailed explanation-1: -All of today’s camels are descended from the same camel ancestors. These ancestors lived in North America about a million years ago. Through natural selection, descendants of the original camel ancestors evolved the diversity they have today. The biogeography of islands yields some of the best evidence for evolution.

Detailed explanation-2: -Biogeographical patterns provide clues about how species, both alive and extinct, are related to each other. The fossil record, though incomplete, provides valuable information about what species existed at particular times in Earth’s history.

Detailed explanation-3: -The biogeography of islands yields some of the best evidence for evolution. Consider the birds called finches that Darwin studied on the Galápagos Islands (Figure 9.3. 7)). All of the finches probably descended from one bird that arrived on the islands from South America.

Detailed explanation-4: -Camels and a variety of other mammals migrated across the Bering land bridge, a temporary bridge of land, roughly 1, 000 miles, which connected present-day Alaska to Siberia. From there they migrated down to the Middle East and Asia.

Detailed explanation-5: -Broadly, the theory of evolution is supported by biogeography through evidence such as the species on Earth being distributed around the planet based on their genetic relationships to each other.