AP BIOLOGY

Detailed explanation-1: -Migration is the regular seasonal movement, often north and south, undertaken by many species of birds. Bird movements include those made in response to changes in food availability, habitat, or weather.

Detailed explanation-2: -Most often birds move to breeding grounds in the spring and then to wintering grounds in the fall. Some species make an additional movement to a third location, such as a molt migration to a location for molting (i.e., replacing of the feathers).

Detailed explanation-3: -The correct answer is (C). Phenology is the study of the migration of the birds from one place to another. The migration of the birds is the regular and seasonal movement, which mainly occurs north and south along a flyway and between breeding and the wintering grounds.

Detailed explanation-4: -Migration is a pattern of behavior in which animals travel from one habitat to another in search of food, better conditions, or reproductive needs.

Detailed explanation-5: -Migratory birds fly hundreds and thousands of kilometres to find the best ecological conditions and habitats for feeding, breeding and raising their young. When conditions at breeding sites become unfavourable, it is time to fly to regions where conditions are better.