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The cell theory states that the cell is the basic unit of structure and function in living organisms, not just their basic unit of life.

Genes are fundamental units of heredity. However, they function by forming proteins that influence physical characteristics.

Evolution drives species diversification, through natural selection and genetic changes over time.

In biology, organisms vary in their survival abilities, due to environmental factors, genetic mutations, and natural selection.

Cells are essential for reproduction, and replication may occur at the molecular level with DNA. But, cells are not only for reproduction.