It is the last choice because their similar bone structures suggest they once had a common ancestor, which is why they are all mammals.
Don't trust me on this one, but i'll say d.
Answer:
The theories are grouped into four major theory types: (1) psychometric theories; (2) cognitive theories; (3) cognitive-contextual theories; and (4) biological theories.
<span>the answer is light microscopes.</span>
It is known as a innate behavior
