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Look at these details from a paragraph about the same topic:
• Feathers trap air close to a bird's body to keep it warm.
• Also, feathers help keep birds dry and protect them from the sun.
• Some birds even use their feathers to help them catch and eat insects.
Choose the main idea that ties all the details together.
A. Birds communicate using various sounds.
B. Feathers help birds float and stay warm.
C. Feathers have uses beyond helping birds fly.
D. Birds can use feathers to make their nests.​