• Amphibians reproduce sexually with external or internal fertilization.
  • Their eggs are usually covered in a jelly-like substance, like the frog eggs shown in Figure below.
  • The “jelly” helps keep the eggs moist and offers some protection from predators.
  • Most amphibian species go through a larval stage that is very different from the adult form.
  • The early larval, or tadpole, stage resembles a fish.
  • It lacks legs and has a long tail, which it uses to swim.
  • It also has gills to absorb oxygen from water.
  • As the larva undergoes metamorphosis, it grows legs, loses its tail, and develops lungs.
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