1. Birds are able to fly because _____________.
a. they are able to control air currents,
b. they have colorful feathers.
c. they have light and hollow bones,
d. they have scales all over their bodies.
a. they are able to control air currents,
b. they have colorful feathers.
c. they have light and hollow bones,
d. they have scales all over their bodies.
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Answer:
C.they have a light hollow bones