Question

multiple choice question
what evolved in the ancestor of reptiles and mammals that protected a developing embryo from drying out on land?
amniotic egg
lungs and limbs
external fertilization
thick mantle

Explanation:

The amniotic egg has a shell and membranes that create a stable environment for the embryo, preventing it from drying out. Lungs and limbs are for respiration and movement. External fertilization occurs outside the body (usually in water) and doesn't protect the embryo from drying. A thick mantle is a feature in mollusks, not relevant here.

Answer:

amniotic egg