Which of the following behaviors allows a bird to maintain a constant body temperature in extremely hot weather?
a. spreading wings
c. flattening feathers
b. panting
d. all of the above
user: bird bones are adapted for flight because they
a. are dense
c. are hollow
b. contain bone marrow
d. are longer than the bones of most animals

d. All of the above

These behaviors;

Spreading wings
Flattening feathers
panting

are all evolutionary process to maintain body temperature. Birds are warm-blooded animals. Also known as homeotherms, which is defined as having the constant body temperature. This is a vital function for the survival of the specie.



c. are hollow

The bones of most birds are hollow in order for the weight of the birds to be light for them to fly. 

A.true this might be wrong, but if it's not wrong, mark me brainliest.