Question

The occurrence of the same amino acid sequence in digestive proteins in two morphologically unrelated species provides evidence that these two species —
A
occupy the same niche
B
have analogous structures
C
descended from a common ancestor
D
have evolved convergently

Answer 1

C

Identical amino acid sequences indicate genetic homology — the proteins were inherited from a common ancestor. Convergent evolution or analogous structures can produce similar function but typically not identical sequences, and sharing a niche doesn't require identical protein sequences.