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a collection of tissues that carry out a specialized function of the body
made up of just one cell that performs all of the functions necessary for life.
made up of more than one cell
The process by which plants, algae, and some bacteria use sunlight, carbon dioxide, and water to make food.
millions of tiny air sacs that make up the lungs
a group of organs that work together to perform body functions.
A living thing; anything that can carry out life processes independently.
A group of similar cells that perform a common function.
The arrangement of parts in an organism
the special, normal, or proper activity of an organ or part.