System A group of objects or phenomena that interact or work together.

Classification Grouping based upon shared characteristics.

Cell Smallest living unit that is able to perform the basic functions of life.

Tissue Group of cells that work together.

Organ 2 or more types of tissue that work together to perform a function.

Photosynthesis The process plants use to capture energy from sunlight and convert it to chemical energy. Lllllllllllll Llll Lll Lllllll lllll llllllllll lllllllllllllllllllllll

Cellular Respiration Process in which cells use oxygen to release energy stored in sugars.

Stimulus Something that produces a response from an organism.

Behavior An organisms action in response to a stimulus.

Adaptation Characteristic, behavior, or inherited trait. Makes a species able to survive in a particular environment.

Characteristic Trait. Attribute. Distinguishing feature.

Structure The framework of something; How it is put together.

Function The natural action of something; How it works.

An animal that does not have a backbone. Invertebrate

Vertebrate Animal that has a backbone.

Exoskeleton A strong outer covering made of chitin. Protects cells, tissues and organs. Some invertebrates have them.

Endoskeleton Vertebrates have them. Internal support system. Grows as the animal grows.

Animals whose body temperature changes with the environment. (Cold blooded.) Ectotherm

Endotherm Animals that maintain a constant body temperature. (Warm blooded.)

Mammal Warm-blooded vertebrates Females give birth to live young Have hair, produce milk

Reptile Cold-blooded vertebrates Covered with scales or horny plates Have lungs

Amphibian Cold-blooded vertebrates Babies live in water and use gills Adults live on land and use lungs