| A | B |
|---|
| oxygen | Animals breathe ____. |
| specialized cells | Animals have tissues and organs formed from ___. |
| multi- | Animals are uni-/multi- cellular. |
| invertebrates | animals without a backbone |
| More species of animals are invertebrates/vertebrates. | invertebrates |
| symmetry | matching form on opposite sides of a dividing line |
| types of symmetry | bilateral and radial |
| bilateral | mirror-image left and right halves |
| radial | parts arranged equally around a middle point |
| cnidarians | invertebrates with radial symmetry, a saclike body, a true mouth, and the ability to digest food |
| examples of cnidarians | jellyfish and coral |
| echinoderms | ____ have spiny skins |
| examples of echinoderms | starfish, sea urchins, and sea cucumbers |
| sponges | ___ lack tissues and symmetry. |
| _____ filter food from the water that passes through them. | sponges |
| arthropods | largest and most diverse group of animals |
| jointed | Arthropods have ____ appendages. |
| exoskeleton | hard outer covering |
| have bilateral symmetry | arthropods |
| examples of arthropods | lobster, crabs, spiders, and insects |
| mollusks | ___ have soft bodies and most have shells. |
| examples of mollusks | clams, oysters, snails, squids, and octopuses |
| parasites | ____ live and feed off the body of a host. |
| vertebrates | animals with a backbone |
| warm-blooded | Cold-blooded / warm-blooded animals have the ability to maintain a constant internal body temperature. |
| environmental | In cold-blooded vertebrates body temperature depends on ___ temperature. |
| types of cold-blooded vertebrates | fish, amphibians, and reptiles |
| gills | allow fish to breathe water in order to get oxygen |
| amphibians | vertebrates with smooth moist skin that begin life in water but live part of the time on land |
| water | Amphibians need ___ to reproduce. |
| lay eggs | Amphibians must ____ in water or moist place. |
| examples of amphibians | frogs, toads, salamanders, and newts |
| reptiles | ____ have tough, dry, flexible, scaly skin. |
| on land | Reptiles reproduce on land/in water. |
| examples of reptiles | snakes, turtles, tortoises, lizards, crocodiles, and alligators |
| crocodiles | Crocodiles/Alligators live all over the world |
| alligators | Crocodiles/Alligators live in the southeastern U.S. |
| visible | The lower teeth of a crocodile are visible/not visible with the mouth closed. |
| not visible | The lower teeth of an alligator are visible/not visible with the mouth closed. |
| Cold-blooded | Cold-blooded / warm-blooded animals lack the ability to maintain a constant internal body temperature. |
| types of warm-blooded vertebrates | birds and mammals |
| feathers | Birds are the only group of animals that have ____. |
| birds | ____ are the only group of animals that have feathers. |
| beaks | Birds have ___ instead of teeth. |
| teeth | Birds have beaks instead of ____. |
| brains | Mammals have the largest ___ in the animal kingdom. |
| mammals | ____ have the most complex organs and nervous systems in the animal kingdom. |
| milk | Mammals feed ___ to their young. |
| live | Mammals give birth to ___ young. |
| classification system | taxonomy |
| smaller groups | To organize species, scientists divide kingdoms into ____. |
| kingdoms | To organize species, scientists divide ___ into smaller groups. |
| species | the most specific level of classification |
| the most general level of classification | kingdom |
