Which of these characteristics is common only at the embryonic stage of fish and humans, and is suggestive of a common ancestor between the two? A) presence of lungs B) presence of a tail C) presence of gill slits D) presence of a vertebral column

C.)

Explanation:

All vertebrates have a vertebral column. Lungs are present only in humans. A tail, though not fully developed, exists in humans in the adult stage too. The presence of gill slits at the embryonic stage of both groups suggests an ancient common ancestor.

it is c) presence of gill slits