why birds are able to fly?
a.they have colorful feathers.
b.they have hollow bones.
c.they are able to control air currents.
d.theeey have scales all over their bodies.
a.they have colorful feathers.
b.they have hollow bones.
c.they are able to control air currents.
d.theeey have scales all over their bodies.
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C. They are able to control air currents