Even If Philosophers Accept and Study the Importance of Change,a

Even if philosophers accept and study the importance of change,a full theory of evolution by natural selection cannot exist without

A) understanding the sorts of changes that have taken place.
B) recognizing the significance of testing one's hypotheses.
C) realizing that some species go extinct over time.
D) realizing the vast expanses of time over which some changes take place.
E) B and C