The eggs of amphibians can dry out easily because they lack a shell or protective membrane.

Here's why:

* No Shell: Unlike reptiles or birds, amphibian eggs don't have a hard, protective shell.

* Thin Membrane: The membrane surrounding amphibian eggs is very thin and permeable, allowing water to pass through easily.

* Moist Environment: Amphibians need to lay their eggs in moist environments, like ponds or streams, to prevent them from drying out.

This is a major factor that limits amphibians to living near water sources.