Question

which comparison best shows that two species share a common ancestor? both have a habitat in water. one breathes through the gills, while the other breathes through the lungs. both have bones in their limbs. one has legs for walking, while the other has fins for swimming. both have body coverings. one has fur for warmth, while the other has scales for protection. both have wings on their bodies. one is covered in feathers, while the other is covered in scales.

Explanation:

Homologous structures indicate a common ancestor. Limbs with bones are homologous structures despite different functions (walking and swimming). The other options describe analogous or different - type features.

Answer:

Both have bones in their limbs. One has legs for walking, while the other has fins for swimming.