give 2 example of the class pisce amphibia rephila aves and mammals
Answers
Animals in the class Amphibia click this icon to hear the preceding term pronounced spend part of their lives under water and part on land. Frogs, toads, and salamanders are amphibians. Many of these species must keep their skin moist by periodically returning to wet areas. All of them must return to water in order to reproduce because their eggs would dry out otherwise. They start life with gills, like fish, and later develop lungs to breathe air.
2 photos--a salamander and a frog
Salamander and frog (class Amphibia)
The class Reptilia click this icon to hear the preceding term pronounced includes turtles, snakes, lizards, alligators, and other large reptiles. All of them have lungs to breathe on land and skin that does not need to be kept wet. They produce an amniote click this icon to hear the preceding term pronounced egg which usually has a calcium carbonate rich, leather hard shell that protects the embryo from drying out. This is an advantage over fish and amphibians because the amniote egg can be laid on land where it is usually safer from predators than it would be in lakes, rivers, and oceans.
3 photos--a tortoise, a snake, and a lizard
Tortoise, snake, and lizard (class Reptilia)
Amniote egg
The class Aves click this icon to hear the preceding term pronounced includes all the birds. They also produce amniote eggs but usually give them greater protection from predators by laying them high off of the ground or in other relatively inaccessible locations. In the case of both reptiles and birds, the eggs are fertilized within the reproductive tract of females. There are other striking similarities between reptiles and birds in their anatomies and reproductive systems. This is not surprising because birds are descendents of theropod dinosaurs (two-legged mostly carnivorous dinosaurs).
3 photos--a small yellow bird, a penguin, and an eagle
Birds (class Aves)
Dogs, cats, bears, humans and most other large animals today are members of the vertebrate class Mammalia click this icon to hear the preceding term pronounced. All mammals conceive their young within the reproductive tract of the mother and, after birth, nourish them with milk produced by their mammary glands click this icon to hear the preceding term pronounced. Mammals are heterodonts click this icon to hear the preceding term pronounced with strong jaws. That is to say, they have a variety of specialized teeth (incisors, canines, premolars, and molars). This allows them to chew their food into small pieces before swallowing it. Subsequently, they can eat any size plant or animal. Many reptiles must swallow their prey whole, which limits them to hunting smaller game.
photo of a chimpanzee showing mammalian heterodontism--the canine, incisor, molar, and premolar teeth are highlighted
Mammalian heterodontism
Like birds, mammals are endothermic click this icon to hear the preceding term pronounced, or warm blooded. They are able to maintain a relatively constant body temperature regardless of external environmental conditions mainly by using internal physiological mechanisms. In other words, they are homeothermic, or stable in core body temperature, as a result of endothermy. All of the living species of insects, fish, reptiles, and amphibians are ectothermic click this icon to hear the preceding term pronounced, or cold blooded. They keep their body temperature in a normal range mainly by avoiding exposure to environmental temperature extremes. For instance, reptiles usually remain in shaded areas on hot days to prevent fatal overheating. On cold nights, their lowered body temperature can cause them to become sluggish and inactive. In contrast, endothermic animals are able to remain active at night and often in the winter when the air temperatures are especially cold. They can also move about in the heat of very warm days. This ability most likely provided an advantage for the early small mammals in surviving alongside dinosaurs and other large reptiles, which apparently were mostly ectothermic. The downside of endothermy is the need to consume far more calories relative to body size in order to maintain a constant core body temperature. Small mammals, such as moles with their rapid metabolism rates, must eat insects or other high calorie foods every half hour or so in order to stay alive. By comparison, cold blooded rattlesnakes usually eat only once every 3-6 weeks and have been known to go without food for as long as two years.
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Class Pisces example, Scoliodon, Sting ray, Rogi, Latka,etc.
Class Aves example, Pavo cristatus(peacock), Sparrow, Columba Livia(pigeon) .
Class Mammalia example, Panthera leo, Homo sapiens, cow, whale,etc.
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