Listed below are characteristics that serve as evidence of shared ancestry between fish and reptiles. Select the option that applies only to the embryos rather than adults.

Answer 1

Both fish and reptiles have:

1. A similar spinal cord structure
2. Gills
3. A two-chambered heart
4. A notochord
5. A post- tail

Only option 5, a post- tail, applies specifically to embryos rather than adults.