Iput it in the wrong category !
pls

which describes a difference between birds and mammals?

birds protect and feed their young.

birds have nearly hollow bones.

birds undergo internal fertilization.

birds efficiently transport oxygen to cells.

Birds have nearly hollow bones

birds have nearly hollow bones

Explanation:

Their bones are nearly hollow which greatly reduce their weight and allow them to fly

c) up is the direction the magnetic force is acting on the charge.

report!

explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."