Molecules
A group of atoms bonded together representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction
Atoms
The basic unit is a chemical element
Cells
The smallest units of matter that can carry on all the processes of life
Muscle
A band or bundle of fibrous tissue in a human or animal body.
Organ
A part of an organism that is typically self contained and has a specific vital functions.
Organ System
A group of organs that work together to perform more than one function.
Individual
A single human being
Population
A community of a