Webquest ecology of amphibians answer key 2025

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Most amphibians breathe through lungs and their skin. Their skin has to stay wet in order for them to absorb oxygen so they secrete mucous to keep their skin moist (If they get too dry, they cannot breathe and will die).
Fossil records identified that fish emerged 530 million years ago during the Cambrian explosion, while amphibians appeared 400 million years ago during the Devonian period. The age of fish was during the Devonian and Silurian periods.
Within their ecosystems, amphibians play extremely important roles as both predators and prey for other organisms. Most amphibians are carnivorous predators. Frogs feed primarily on insects, segmented worms, and mollusks, whereas salamanders feed on both invertebrates and frog tadpoles.
And so these ancient creatures evolved, down through the entire Carboniferous era and into the Permian era, just before the emergence of dinosaurs. A characteristic of the Permian is that larger terrestrial fauna began to emerge, and amphibians were no exception.
Amphibians are small vertebrates that need water, or a moist environment, to survive. The species in this group include frogs, toads, salamanders, and newts. All can breathe and absorb water through their very thin skin. Amphibians also have special skin glands that produce useful proteins.
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One major difference to tell right away if that long, legless animal is a snake or a caecilian: Skin. Reptiles have scales, and their skin is dry. Amphibians do not, and their skin is often moist with mucus, which keeps them from drying up.

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