Introduction

Cell theory:

Cells are the fundamental units of life and all living things are composed of one (unicellular) or more (multicellular) cells or the secreted products of those cells.

Gene theory:

A gene is a unit of heredity and corresponds to a region of the DNA that influences the form or function of an organism in specific ways.

Theory of evolution through natural selection:

Central organizing concept of biology. Life changes and develops through evolution and all life-forms known have a common origin.

(States that individuals with advantageous traits survive and reproduce more often, passing those beneficial traits to their offspring.)

Theory of homeostasis:

Ability of all living organisms to regulate its internal environment to maintain stable conditions.