Science part 1

• the different animals belong to a group of animals called vertebrates
• fishes are vertebrates with skeleton made with either bone or crtilage
• jawless fish, also called superclass agnatha
• most of the worlds fished are bony fish. also known as osteichthyes
• the cartilaginous fish, also called chonarichthyes
• amphibians are four-legged vertebrates
• reptiles, like fished and amphibians are ecothermic vertebrates that have dry, waterproof bodied covered with scales
• all birds have feathers, though, not all can fly
• mammals are the most complex of all vertebrates
• mammals that lay eggs are called egg-laying mammals or monotremes
• marsupials are popularly known as pouched mammals
• eutherian mammals, also referred to placental mammals, give birth to live youngs