FC: Amphibians Joseph Mills, Maurice Bennett and Liam Turner
1: Kingdom - Animalia Phylum - Chordata SubPhylum - Vertebrata Class - Amphibia Order - Salamanders, Frogs and Toads
2: An amphibian is an ectothermic vertebrate that spends its early life in water.After they're done living in water, they usually spend their adult life on land. When they first hatch underwater they are equiped with gills to obtain oxygen. After they experience metamorphosis, they grow lungs. Adult amphibians use lungs to get rid of carbon dioxide and obtain oxygen they get through they're thin moist skin
3: Most adult amphibians have strong skeletons and muscular limbs adapted for movement.
4: Circulation The circulation of a tadpole has a single loop of circulation, just like a fish. But the circulation of many adult amphibians consists of two loops. In the first loop, blood flows from the heart to the lungs and skin. This loop also picks up oxygen. This blood that is rich with oxygen then returns to the heart. In the second loop, the blood flows to the rest of the body, delivering oxygen-rich blood to the cells.
5: Reproduction All amphibians reproduce sexually. Most frogs a toads have external fertilization; the female frog releases eggs that are then fertilized by male's sperm. In contrast, most salamanders have internal fertilization; the eggs are fertilized before they are laid. Most amphibians undergo a process called metamorphosis (a process in which an animal's body undergoes dramatic changes in form during its life cycle). The hind legs appear, followed by changes in the skeleton, circulatory system, and digestive system. Later the front legs appear; at the same time tadpoles start to lose their gills and begin to breathe with their lungs.
6: Symmetry Amphibians have bilateral symmetry. You can divide the body straight down the middle and both sides will be equal.
7: Biomes Fresh Water, Rain Forest, Tropical Rainforest, Streams and Rivers, Ponds and Lakes.
8: Food Web `
9: Amphibians first evolved in the Devonian Period during the Paleozoic Era almost 408 million years ago.
10: Most tadpoles are herbivores, however, most adult frogs and toads feed on insects & other small animals. They normally sneak up on their prey using the help of their camouflage adaptation. Toads use lumps behind their necks to ooze poisonous liquids to defend against preditors such as raccoons
11: Unlike frogs and toads, some salimanders spend their whole lives in water or on land. Most return to water every year to lay eggs. Lungless salimanders that live on land don't return to the water to lay eggs. They find a moist area on land unlike frogs and toads who return to the water to lay eggs at the end of their adulthood.
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