Answer:
The evolution of the amniotic egg in reptiles allowed animals to colonize land because it prevents the egg from drying out. The amniotic egg is a type of egg that has a shell and four membranes that protect the embryo from desiccation (drying out) and other environmental hazards. This adaptation allowed reptiles to lay their eggs on land, away from water sources, and to colonize terrestrial habitats that were previously inaccessible to them.