| A | B |
|---|
| invertebrate | an animal without a backbone |
| sponge | a simple invertebrate that has a hollow body with a single opening and lives in water |
| cnidarian | an invertebrate with stinging cells on the ends of tentacles |
| mollusk | an invertebrate that has a soft body and a shell |
| echinoderm | a spiny skinned invertebrate |
| endoskeleton | an internal supporting structure |
| arthropod | an invertebrate with jointed legs |
| exoskeleton | a hard covering that protects the bodies of some invertebrates |
| vertebrate | an animal with a backbone |
| warm-blooded | a kind of animal whose body temperature does not change much |
| cold-blooded | a type of animal that gets its heat from outside the body |
| amphibian | cold blooded vertebrate that lives on land and in water |
| reptile | cold blooded vertebrate that lives on land |
| bird | warm blooded vertebrate with feathers |
| mammal | a warm blooded vertebrate with fur or hair |
| skeletal system | the frame that supports an animal's body and protects the organs |
| muscular system | works with skeletal system to allow vertebrates to move |
| nervous system | the master control system of the body and is made up of nerve cells |
| respiratory system | brings oxygen to the blood and removes wasted like carbon dioxide gas |
| circulatory system | move blood through the body |
| excretory system | removes the waste from the body |
| digestive system | helps break down food |
| life cycle | stages of growth and change |
| life span | how long it can live in the wild |
| metamorphosis | to change form |
| clone | an exact copy of its parent |
| heredity | passing on of traits to offspring |
| inherited behavior | a set of actions that parents pass on to their offspring |
| instinct | a way of acting that an animal does not have to learn |
| learned behavior | an animal changes its behavior through experience |
