Biology, or biological sciences, is the study of life divided into focused subfields that study the structure, function, anatomy, origin, and distribution of living organisms.

Learn the chemical process for respiration. Understand what happens during respiration and the different steps in the respiration equation.

Explore population biology. Learn about the definition of population biology and its techniques for research. See the factors studied by population biologists.

Understand the definition of biological fitness, discover what fitness evolution is, learn what causes biological fitness evolution and explore some examples of biological fitness.

Succession in biology refers to the order in which plants and animals occupy a biological community. As one set of plants and animals dies off, another set of plants and animals establish themselves.

Explore vectors in biology. Learn the definition of a vector and understand the different types of vector transmission. See various examples of vectors.

What is a biotic factor? Learn about biotic factors, biotic components, types of biotic factors, and biotic factor influences in this thorough lesson.

Study the diffusion definition. Discover types of diffusion with examples, identify factors that affect the rate of diffusion, and examine diffusion diagrams.

Learn what active transport is and how it takes place. The different types of active transport are explained and some examples are provided for...

Learn the producer and consumer definitions in biology. Study examples of producers in an ecosystem, as well as consumers, and explore how ecosystems are connected.