Answer:
C. Reproduction and Variation
Explanation:
Reproduction could cause gene and chromosomal mutations in the offspring therefore causing variation. The variation could either helpful or detrimental to the offspring depending on the environment and if it helps them live or not.
Answer:
Appendix, in anatomy, a vestigial hollow tube that is closed at one end and is attached at the other end to the cecum, a pouchlike beginning of the large intestine into which the small intestine empties its contents. It is not clear whether the appendix serves any useful purpose in humans.
The answer is anatomy.
