Organism
A living thing that is made of one or more cells, uses energy, moves, responds to its environment, adjust, reproduces, adapts, and has a life span.
Cell
The smallest unit of an organism that can perform life functions.
Stimulus
Anything an organism responds to, such as sound, light, heat, vibration, odor, movement, hunger, thirst, and so on.
Adaptation
Any characteristic of an organism that makes it better survive in its environment.
Homeostasis
The resolution of an organism internal environment to maintain conditions that allows it to live.
Development
All the changes undergone by living things as they grow.
Life Span
The length of time the organism is expected to live.