Question

1. our common ancestors had a tail and a large appendix to aid in their high - cellulose diet. nowadays, instead of a tail, we have a useless tail bone and a small appendix which does not function anymore. all of these are examples of:

a. vestigial structures
b. homologous structures
c. analogous structures
d. fossils

Explanation:

Vestigial structures are remnants of organs or structures that had a function in ancestral species but are now non - functional or have reduced function. The tail bone and small appendix in humans fit this definition. Homologous structures have a common origin but may have different functions. Analogous structures have similar functions but different origins. Fossils are preserved remains of organisms from the past.

Answer:

A. vestigial structures