| A | B |
|---|
| phylum | subdivision of kingdom |
| species | a group of organisms that can breed with each other to produce offspring like themselves |
| scientific name | the name given to each species, consisting of its genus and its species label |
| cartilage | a soft material found in vertebrate skeletons |
| vertebra | one of the bones or blocks of cartilage that make up a backbone |
| vertebrate | an animal with a backbone |
| mammary gland | a milk-producing structure on the chest or abdomen of a mammal. |
| gill | a structured used by some animals to breath in water |
| metamorphosis | a major change in form that occurs as some animals develop into adults |
| swim bladder | a gas-filled organ that allows a bony fish to move up and down in the water |
| reptile | a vertebrate that breathes with lungs and lays soft-shelled eggs on land |
| taxonomy | the science of classifying organisms based on the features they share |
| amphibian | a vertebrate that lives at first in water and then on land |
| bilateral symmetry | a body plan that consists of left and right halves that look the same |
| invertebrate | an animal that does not have a backbone |
| radial symmetry | an arrangement of body parts that resembles the arrangement of spokes on a wheel |
| tentacle | an arm-like body part in invertebrates that is used for capturing prey |
| tube foot | a small structure used by echinoderms for movement |
| molting | the process by which an arthropod sheds its external skeleton |
| pupa | a stage in the development of some insects that leads to the adult stage |
