In the past, whales had legs. From whales no longer having legs, its technically a mutation. With this, it means they can no longer go onto land, so they learned to adapt to the water.
External fertilization is the correct answer.
<span>Accurately
describes the scientific theory is to provide a systematic way for obtaining
evidence to support or refute a hypothesis. Correctly describes a scientific
hypothesis it is an educated guess that loses credibility if it is falsifiable and
fact is something that is been observed or experienced by many observers and
agreed to be true.</span>
Answer:A
Explanation:The anatomy and behavior of that animal's immediate ancestor..
