Anything that has or once had all the characteristics of life.

Orderly structure shown by living things.

Process that results in mass being added to and organism; may include formation of new cells and new structure.

Changes an organism undergoes in its lifetime before reaching its adult form.

Production of offspring.

A group of organisms that can interbreed and produce fertile offspring.

Any change in an organism’s internal or external environment that causes the organism to react.

Organism’s reaction to a stimulus.

Regulation of an organism’s internal environment to maintain conditions needed for life.

Inherited characteristic of a species that develops over time in response to an environmental factor, enabling the species to survive.