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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

Respuesta :

Answer:

Migration

Explanation:

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.