Introduction to Biology

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A series of free High School Biology Video Lessons.

Biology Definition
Biology is a natural science that studies the growth and function of life and living things. It studies everything from the basic building blocks of life to the interactions between communities and populations. Biology depends on many elements of Chemistry, since important physical processes rely upon chemical reactions. Scientific Method
The scientific method is a set of guidelines for scientific investigation. It helps us approach all scientific experiments and inquiries methodically and scientifically in order to avoid jumping to conclusions or missing links in a logical chain. The five steps of the scientific method include 1) defining the problem 2) making observations, 3) forming a hypothesis, 4) conducting an experiment and 5) drawing conclusions.
The 5 steps of the scientific method. Science Experiments
Experimentation is the fourth step of the scientific method. Science experiments are necessary to test hypotheses and to form accurate conclusions based on real world results. All branches of science conduct experiments.
How to design a scientifically sound experiment. Characteristics of Life
Characteristics of life include living things that are made of cells or cell products, use energy, respond to changes in the environment, maintain homeostasis and reproduce with similar offspring. These characteristics define whether something is living or not.