Question

which of the following structure pairs provides the best evidence of a common ancestor based on the anatomical similarities?
a bee wings and bird wings
b legs on a beetle and legs on a cat
c whale flipper and bat wing
d human eyebrows and ant antennas

Explanation:

Homologous structures (which indicate common ancestry) are anatomical features that have a similar underlying structure but may have different functions. Legs on a beetle (an insect) and legs on a cat (a mammal) are not homologous. Bee wings and bird wings (A) are analogous (similar function - flight, different structure - insect vs. vertebrate). Whale flipper and bat wing (C) are homologous (both are vertebrate fore - limbs with similar bone structure). Human eyebrows and ant antennas (D) are completely different structures. The question asks for the best evidence of a common ancestor based on anatomical similarities. Homologous structures (like whale flipper and bat wing) show common ancestry.

Answer:

C. Whale flipper and bat wing