Why do animals behave in ways that are most likely to increase their genetic fitness quizlet?

Use this information and your knowledge of biology to answer the questions below.

Seven populations of salamanders in the genus Ensatina occur throughout the western edge of the United States (see figure below). For years, these populations were considered separate species, because they look different from each other. However, biologists studying these populations discovered that most of these population interbreed to produce viable and fertile hybrids. The only two populations that cannot interbreed are the ones at the southern edge of the range, referred to as Ensantina klauberi and Ensatina eschscholtzii.

Populations of salamanders with distinct color patterns can interbreed, except where they come into contact at the southern portion of the range.

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