Amphibians
An amphibian's very thin skin isn't covered by fur, feathers, or scales. This makes them vulnerable to temperature change, but also offers several advantages. Amphibians can breathe through the entire surface of their bodies. In the case of the lung-less salamanders , gas exchange through the skin alone provides sufficient oxygen.
Water is also absorbed through an amphibian's skin making drinking unnecessary. Even in areas where open or running water is scarce, an amphibian's skin can absorb moisture from damp soil. Amphibians have a startling variety of color which results from different combinations of pigments within their skins. These patterns of coloration are usually designed to provide defense from predators. |
The skeleton of amphibians has both bony and cartilaginous components in different ratios, depending on the strength required for locomotion.
Salamanders have a largely cartilaginous skeleton, while that of frogs is more rigid and bony to withstand the impact of jumping and landing. Amphibian lungs are paired and they have a 3-chambered heart, unlike mammals, which have 4-chambered hearts. Most amphibians' offspring are born externally. Like for example, the frog lays its eggs in the water and are later hatched without the necessity of the parent. |
When compared to the mammalian heart, you can see how amphibians
only have 3 chambered hearts unlike mammals that have 4 chambered hearts.
only have 3 chambered hearts unlike mammals that have 4 chambered hearts.