Question

if two species show similarities in fossil records, similar dna or proteins, similar embryology, or similar anatomy...they have a
similar environment similar population size similar adaptations common ancestor

Explanation:

The question is about evolutionary biology concepts. Similarities in fossil records, DNA/proteins, embryology, and anatomy are key evidence for a common ancestor (as these traits are inherited from a shared ancestor). "Similar environment" relates to convergent evolution (not direct similarity source), "similar population size" is unrelated to these biological similarities, and "similar adaptations" can be convergent (not from shared ancestry). So the correct option is "Common ancestor".

Answer:

D. Common ancestor (assuming the options are labeled A - D as A. Similar environment, B. Similar population size, C. Similar adaptations, D. Common ancestor)