Question

Identify the structure found in the early embryonic stages of amniotes that provides a clue to their aquatic ancestry.

• A. Endostyle
• B. Nuclei Pulposi
• C. Nonfunctional Pharyngeal pouches
• D. Air Bladder

Hint:

Pharyngeal pouches, which were functional in early vertebrates, are now vestigial in terrestrial amniotes but provide evidence of their aquatic ancestry.

Answer 1

The Correct Option is C

Nonfunctional pharyngeal pouches are present in the early embryonic stages of amniotes and are believed to be a vestige of their aquatic ancestors, as they are involved in respiration in aquatic organisms.