The Answer Is A. Hope This Helps ;P
Answer: The literal reason would be because our ancestors did. The ancestors of all modern mammals had five digits on each limb up to 360 million years ago.
Explanation:
Answer is B.) nonrenewable only
Nuclear energy is usually considered as renewable energy. But the material which used in the nuclear power plants is non-renewable resource. A rare type of a uranium which is U-235 is used nuclear power plants. This element is a non-renewable resource. Nuclear energy from uranium is released through a process called nuclear fission. In the nuclear fission the nucleus of a uranium atom splits to give energy.