What is the primary advantage of the amniotic egg for reptiles?

What is the primary advantage of the amniotic egg for reptiles?

• A. Allows life on water
• B. Allows life on dry land
• C. Requires aquatic environments
• D. Requires gills

Answer: (B)

The main idea is that the amniotic egg lets embryos develop on dry land by providing a self-contained, water-retaining environment. Inside the shell, the embryo is cushioned by the amnion and receives nourishment from the yolk, while the chorion and allantois manage gas exchange and waste in a way that works outside water. This combination protects the developing embryo from desiccation and environmental fluctuations, so it doesn’t need to remain in or return to aquatic surroundings. Gas exchange occurs through these membranes rather than through gills, and the shell further reduces water loss while offering protection. Because of this, reptiles can reproduce away from water and inhabit dry habitats.

The main idea is that the amniotic egg lets embryos develop on dry land by providing a self-contained, water-retaining environment. Inside the shell, the embryo is cushioned by the amnion and receives nourishment from the yolk, while the chorion and allantois manage gas exchange and waste in a way that works outside water. This combination protects the developing embryo from desiccation and environmental fluctuations, so it doesn’t need to remain in or return to aquatic surroundings. Gas exchange occurs through these membranes rather than through gills, and the shell further reduces water loss while offering protection. Because of this, reptiles can reproduce away from water and inhabit dry habitats.