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A. The lizards and snakes have a common ancestor. Evolution is change over time. For example, Darwin discovered many different types of finches, but they all had different shaped beaks and different diets. The reason this happens is because the finches had separated and lived on different islands where there was different food so their beaks had to adjust to the food provided for them. In other words, finches started out as one species, but diverged into different, but very similar birds.
Comparing the anatomy of two closely related animals is important because (A) a greater number of shared characteristics would mean that they have recently diverged from a common ancestor.
Homologous characteristics
If two or more species share a certain physical trait, such as a complex bone structure or body plan, they may all have inherited that trait from a common ancestor. Physical characteristics shared due to evolutionary history (a common ancestor) are called homologs.
Similar characteristics
To make things a little more interesting and complicated, not all seemingly similar physical features are marks of common ancestry. Rather, some physical similarities are analogous: they evolved independently in different organisms because the organisms lived in similar environments or underwent similar selective pressures. This process is called convergent evolution. (Converging means going in the same direction, like two lines meeting at a point.)
With this information, we can say that the correct alternative is letter A, a greater number of shared traits would mean they recently diverged from a common ancestor.
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