Evolution of Live Birth and Egg Laying

What evolutionary change occurs in reptiles as they move to colder climates?

• They start laying more eggs.

• They stop laying eggs altogether.

• They retain their eggs longer for better survival.

• They develop thicker eggshells.

Why is it unlikely for humans to start laying eggs again if they move to warmer climates?

• Egg-laying is less efficient.

• The ability to form egg layers was lost in our lineage.

• Warm climates do not support egg survival.

• Humans have always given live birth.

What is one of the key differences between egg-laying and live birth?

• Eggs have additional layers and a mineral coating.

• Live birth requires more energy.

• Egg-laying is faster.

• Live birth is more common in reptiles.

According to Doolo's law, what happens when a trait is completely lost?

• It becomes dominant in the species.

• It can easily re-evolve in the same form.

• It is unlikely to evolve again in the same way.

• It is replaced by a similar trait.

If egg-laying were to re-evolve in humans, what is likely to happen?

• It would occur only in cold climates.

• It would be identical to ancestral egg-laying.

• It would take a different evolutionary path.

• It would not be possible at all.