Term | Definition |
amphibian | an animal that lives part of its life underwater and another part of its life on land |
antennae | appendages of the head that are used for sensing smell and touch |
appendage | a structure that grows out of an animal’s body |
bony fish | fish that have skeletons made mostly of bone |
cartilage | a tough, flexible tissue that supports and shapes the bodies of some fish and some animal parts |
cartilage fish | jawed fish in which the entire skeleton is made of cartilage |
chordate | an animal that, at some time in its life, has a tough, flexible rod along its back |
cold-blooded | having a body temperature that changes with the temperature of the surroundings |
compound eye | eyes with many lenses |
endoskeleton | a skeleton on the inside of the body |
exoskeleton | a skeleton on the outside of the body |
gill | a structure used by fish and some other animals to breathe in water |
hibernation | a state of being inactive during cold weather |
jawless fish | fish that have no jaws and are not covered with scales |
jointed-leg animal | an invertebrate with an outside skeleton, bilateral symmetry, and jointed appendages |
mammal | an animal that has hair and feeds milk to its young |
mammary gland | body parts that produce milk |
molting | shedding an exoskeleton |
reptile | an animal that has dry, scaly skin and can live on land |
spiny-skin animal | an invertebrate with a five-part body design, radial symmetry, and spines |
tube feet | parts of a starfish that are like suction cups and help the starfish move, attach to rocks, and get food |
warm-blooded | having a body temperature that is controlled so that it stays the same no matter what the temperature of the surroundings |