Genetic variation describes naturally occurring genetic differences among individuals of the same species. This variation permits the flexibility and survival of a population in the face of changing environmental circumstances. What is an innate behavior some birds display in response to shortening day length, drop in temperature, or the beginning of winter
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987david428 4 months ago
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The bird gets cold and quickly realizes that if he stays where he is, he will die. You have probably seen birds migrate in your life, I know I have. Birds migrate in large flocks or "V" shaped flocks. If you were to see migrating birds they would be around during the fall season.

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