A watertight egg is a type of egg that has a protective shell designed to retain moisture and prevent desiccation, allowing for the successful development of embryos in terrestrial environments. This adaptation was crucial for the evolution of vertebrates, particularly in the transition from aquatic to land-based life forms. The evolution of the watertight egg marked a significant step in reproductive strategies, providing a safe and stable environment for developing embryos away from water bodies.
congrats on reading the definition of watertight egg. now let's actually learn it.