Biology ppt
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Amphibians differ from fish in lacking scales and having mucus glands and a three-chambered heart. They breathe through gills or lungs, lay eggs, and can be found both in water and on land. Examples include frogs, toads, salamanders, and caecilians, which resemble large earthworms. All amphibians are cold-blooded and metamorphose from juvenile to adult forms, inhabiting varied environments across continents except Antarctica.
Biology ppt
- 1. These animals differ from the fish in the lack of scales, in having mucus glands in the skin, and a three chambered heart. Respiration is through their either gills or lungs. They lay eggs. These animals are found both in water and on lands. Frogs, toads and salamanders are some examples.
- 2. Most people are familiar with frogs, toads, newts and salamanders, but are less familiar with caecilians, which superficially resemble large earthworms. Little is known about most caecilians as they mostly live hidden underground or underwater. All amphibians are cold-blooded animals and most metamorphose from a juvenile to an adult form. They cannot generate their own body heat, instead relying on the temperature of their environment to help them keep warm or cool enough to survive. There are over 6,500 species of amphibians, and they inhabit all continents except Antarctica, living in varied habitats such as rainforests, rivers and streams, deserts and alpine environments.