Biology notes on Amphibians.

Notes Frogs, toads, salamanders, and newts ar direct descendants from fish. Amphibians evolved from a type of lobe-finned fish. The soma amphibian is from the Greek amphi, which means double, and bios, which means life. The name is possess because of the fact that they can live in water, as suck up as on land. Fossil evidence indicates that amphibians evolved from lobe-finned fishes some 370 zillion years ago. Recent analysis of the DNA of coelacanths and lungfishes indicates lungfishes be in fact far more closely related to to amphibians than are coelacanths. Amphibians first became common during the Carboniferous period. Biologist attach this age as the age of amphibians. By the late Carboniferous, a great deal of northeast America was covered by low-lying equatorial swamplands. 34 families of amphibians thrived in this wet terrestrial environment, sharing it with pelycosaurs and different archean reptiles. In the Permian period, after the Carboniferous, amphibi ans increased to a enumerate of 40 families. During the early Permian period a remarkable heighten occurred among amphibians, umpteen of them began to leave the marshes for dry uplands. Some of these amphibians had bony plates and armor covert their bodies, and some were as big as a pony. By the mid-Permian, 60 percent of all amphibian species were totally terrestrial.

During the ordinal period these remaining moist-skinned amphibians underwent a highly triple-crown assault of wet habitats all over the world. Today at that place are over 4,200 species of amphibians in 37 incompatible families. take down th ough each amphibian order evolved at a diffe! rent time during the Tertiary period, all modern amphibians do certain(a) key characteristics in common. Legs, lungs, cutaneous respiration, pulmonary veins, and a partially divided heart have helped them to adapt, and is what they all have in common. There are 3,680 species of frogs and toads in 22 families. They... If you want to pop out a full essay, order it on our website: BestEssayCheap.com

If you want to get a full essay, visit our page: cheap essay