Question

from left to right: an american alligator, a hoatzin, and a green frog
choose 1 answer:
a crocodile and frog forelimbs are adapted for walking, but bird forelimbs are adapted for flight.
b crocodiles and birds have eggs that are protected by an amniotic membrane, but frogs do not.
c crocodiles and birds have four limbs, and so do frogs.

Explanation:

• Option A: Frog forelimbs are not mainly adapted for walking (frogs use hindlimbs more for jumping), and some birds (like flightless birds) have forelimbs not adapted for flight, so A is incorrect.
• Option B: Crocodiles (reptiles) and birds lay amniotic eggs (with amniotic membrane), while frogs (amphibians) lay non - amniotic eggs. This statement is correct.
• Option C: While all three (crocodiles, birds, frogs) have four limbs, this is a basic anatomical feature and not a distinguishing or correct comparative adaptation - related statement as the question likely aims for a more specific biological adaptation distinction, and this option is too general and not the best choice compared to B.

Answer:

B. Crocodiles and birds have eggs that are protected by an amniotic membrane, but frogs do not.