Whales have hip bones and pelvis in their skeleton that they no longer use what type of evidence is this ?

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

the answer is c. altitude. hope this ! #brainiac