Question

1. birds do stop for some food and rest during their migrations. they require extra energy at this time. as they move into warmer climates, it becomes easier to find food. this is the primary reason for migration. ________ needs motivate migration.

a civilization b transportation
c education d nutrition

Explanation:

The text mentions birds need extra energy and food - related reasons for migration, which relates to nutrition needs.

Answer:

D. Nutrition