| A | B |
|---|
| symmetry | when parts of an animal's body match up with other parts around a midpoint line |
| learned behavior | when an animal changes its behavior through experience |
| vertebrate | an animal with a backbone |
| sponge | the simplest of invertebrate. |
| cnidarians | an animal with armlike parts that are called tentacles |
| mollusks | an animal with a shell inside or outside its body |
| echinoderm | a spiny skin animal with an internal structure called an endoskeleton |
| endoskeleton | an internal support structure found in animals |
| arthropods | the largest group of invertebrates |
| exoskeleton | a hard covering that protects the body of an invertebrate |
| flatworms | the simplest worm; has a flat body and 3 cell layers thick |
| roundworms | have thin bodies with pointed ends. Most live in body of other animals |
| segmented worms | common earthworms. Body divided into identical segments |
| warm blooded | birds and mammals; use energy from food to keep a constant body temperature |
| jawless fish | a fish with a boneless mouth |
| cartilage | rubbery material that makes skeletons in certain types of fish |
| bony fish | the largest of all vertebrate classes; skeletons are made of bone, and they are covered in scales |
| amphibians | cold blooded vertebrates that spend part of their lives in water and part on land |
| reptiles | dry skin covered with scales or plates vertebrate that live on land |
| birds | warm blooded vertebrate with feathers |
| mammal | warm-blooded vertebrate with fur or hair |
| skeletal system | the frame made up of bone that supports an animal's body |
| muscular system | works with the skeletal system to allow a vertebrate to move; made up of strong tissues |
| nervous system | the master control system of the body; consists of brain and sense organs |
| respiratory system | they system that brings oxygen to the blood and removes waste |
| circulatory system | moves the blood through the body and removes waste from cells |
| excretory | the system that removes waste; liver, kidneys, bladder, skin, and lungs are organs in this system |
| digestive | the system that helps break down food so that cells have energy |
| life cycle | the stages of growth and change in an organism |
| life span | the amount of time that an organism will usually live in the wild |
| metamorphosis | a series of very different body forms that appear in the life of an organism as it grows and develops |
| incomplete | a kind of metamorphosis where each body form is separate, but not that different from the one before |
| molting | when an animal sheds the exoskeleton and grows a new one |
| reproduction | a stage in the life cycle when parent animals make offspring |
| budding | the way that cnidarians and other simple invertebrate reproduce |
| regeneration | when a whole animal develops from just a part of the original animal; sea stars reproduce this way |
| clone | an exact copy of its parents; occurs when animals reproduce by budding or cloning |
| traits | characteristics found in animals |
| inherited traits | traits that are passed from parent to offspring |
| heredity | the passing of inherited traits |
| egg | female cell required for reproduction in some animals |
| sperm | the male cell required for reproduction in some animals |
| fertilization | the joining of the female ane male cell for reproduction |
| embryo | a fertilized egg that has grown which has traits from both its parents |
| inherited behavior | a set of actions that a living thing is born with |
| instinct | a way of acting that an animal does not have to learn |
| invertebrate | an animal without a backbone |
