Chapter 1

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Levels of biological hierarchy

Biosphere

All the environments on earth that are inhabited by life

Ecosystems

All the living things in a particular area

Communities

Entire array of organisms in an ecosystem

Populations

All individuals of a species in the bounds of a specific area

Organisms

Individual living things

Organs and organ systems

Organs carry out particular function in the body. Organ systems are teams of organs that cooperate in a specific function

Tissues

Groups of similar cells

Cells

Fundamental units of structure and function

Organelles

Carious functional components that make up cells

Molecules

Chemical structure with two of more atoms

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