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invertebrates and vertebrates two main groups that animals are classifed into are __________ and ____________. snails, oysters, and clams are mollusks soft Snails, oysters, and clams have ____________ bodies and are supported and protected by one or two shells. hollow bodies Hydras and jellyfish have ____________________. exoskeleton The hard outer shell of a lobster is called an ____________________. arthropods this group of animals makes up 80% of the animal kingdom sea star this animal has strong suction cups that pry open its food worms flat, round, and segmented describe this group of animals lizards, snakes, turtles, alligators, and crocodiles examples of reptiles lungs Reptiles breath with ____________. mammals A whale and a dolphin are ___________ and come up to the surface of the water to breathe. arthropods Lobsters, crabs, spiders, centipedes, millipedes and insects are _____________. gills Fish breathe through ______________. They get oxygen through the water. vertebrate an animal with a backbone invertebrate an animal that has no backbone mammal an animal that has hair or fur and feeds its young with milk produced by the mother frogs and salamanders examples of amphibians 70 Insects make up almost ________ percent of the species of arthropods. sponges _____________ look more like plants than animals. hydras ____________ have snakelike tentacles around their mouths. worms _____________ burrow into the soil and digest decaying matter in it. amphibians _______________ begin their lives breathing through gills, but most develop lungs and live on land. reptiles ___________ have tough scales that protect their bodies fish __________ lay their eggs in the water and spend their whole lives in the water mammals ______________ can be found on land, in the water, and in the air.