2An animal with a backbone is called a vertebrate. A bird is a vertebrate.A human is a vertebrate.
3Vertebrates are classified by how they control their body temperature. Cold blooded vertebrates (fish, amphibians, and reptiles) get heat from outside the body.Warm blooded vertebrates (birds and mammals) use energy from food to keep body temperature constant.
4An animal without a backbone is called an invertebrate. A worm is an invertebrate.An octopus is an invertebrate.
5Cnidarians are invertebrates that have poison stingers on tentacles. Three types of cnidarians areHydraJellyfishSea anemones
6Mollusks are soft bodied invertebrates. Examples of mollusks areSnailsClamsOysterssquids
7Echinoderms are spiny skinned invertebrates. Echinoderms are identified byA star designSpiny skinAn internal supporting structure called an endoskeleton.
8Arthropods make up the largest invertebrate group. Arthropods are identified by a hard skeleton on the outside of their bodies called an exoskeleton.Examples areArachnidsCentipedes and millipedesCrustaceansInsects