What are the characteristics of the five classes of vertebrates
Answers
Answer:
five classes of vertebrates
1)Fishes
2)Amphibians
3)Reptiles
4)Birds
5)Mammals
Explanation:
1)FISHES
*ectothermic, aquatic vertebrates.
*Their skin is generally covered with scales.
*limbs are modified into fins for swimming.
*Breathe with gills.
*They lay eggs that must be in water.
2)AMPHIBIANS
*ectothermic vertebrates.
*Their skin lacks scales, hair, and feathers.
#the skin looks smooth ex.frog
#if the skin looks rough ex.toads
*They lay eggs in water,
*breathes air and can live outside water.
*have three-chambered hearts.
3)REPTILES
* ectothermic vertebrates.
*Their skin has scales, but no hair or feathers.
*have three-chambered hearts.
#except for alligators and crocodiles, which have four-chambered hearts.
*This allows reptiles to lay eggs on land.
4)BIRDS
*endothermic vertebrates.
* skin and body is covered with feathers.
*forelimbs are modified as wings.
*bones are lightweight and usually hollow.
*birds have four-chambered hearts.
5)MAMMALS
*Mammals are endothermic vertebrates.
*Mammals have hair, which varies greatly among species.
*###They have mammary (milk-secreting) glands. (modulation of (sweat) glands)
*mammals have four-chambered heart
Answer:
Vertebrates include amphibians, reptiles, mammals, and birds, as well as the jawless fishes, bony fishes, sharks, and rays. More than 64,000 species of vertebrates have been described, but the extant vertebrate species represent only a small portion of all the vertebrates that have existed.