AnatomyOne way to identify a fish is by its body structure, it has fins and a spine. The anatomical adaptation of fins helps them survive and makes them and marine animals unique in that they use them to maintain position, move, steer, and stop. Most fish have scales and breathe through gills. Most fish also have a layer of mucus that helps them prevent infections. Among what we think of as "fish," there are many that don't really look like land creatures. The strangest species of fish are found in the deep waters of the oceans, such as the Pacific Barreleye, which is distinguished by the fact that its head is a transparent shield filled with liquid. Other strange fish include sheepshead and parrotfish. The body structure of the amphibian is different depending on which species you are looking at. The general characteristics of a frog's body, for example, are very similar to those of human anatomy. Humans and frogs have the same types of organs and organ systems. The frog's anatomy, however, is much simpler. As in other higher vertebrates, the frog's body is divided into a head, a short neck and a trunk. The flat head contains the brain, mouth, eyes, ears and nose. A short, almost rigid neck allows only limited movement of the head. The frog is covered with soft, thin, moist skin composed of two layers, an outer epidermis and an inner dermis. This is a special anatomical adaptation that all amphibians have that has helped them survive. As for the unique species of amphibians, it is worth noting the Chinese giant salamander, the purple frog and the Olm, which is a blind salamander with transparent skin that lives underground, hunts its prey by smell and electrosensitivity and can survive without food for 10 years.W...... middle of paper ......e found in various types of habitats, sky bats, whales and dolphins in the sea, and giants like the elephant on land. Mammals, which constitute the dominant class of the current era since the Cenozoic, are the ones that affect the environment the most, mainly due to the fact that humans are the dominant species on the planet. Man's place in the ecosystem can be seen in all aspects of the current state of the planet. The acquisition and consumption of natural resources, pollution and deforestation are some of the roles that mammals, humans, play on the biome in which they live. BehaviorFish are oviparous, there are some ovoviviparous.Amphibians are oviparous, there are some ovoviviparous. Reptiles are oviparous, there are very few ovoviviparous ones. All birds are oviparous. Mammals are viviparous, except for four species of echidnas and platypus which are oviparous..