Any molecule necessary for or contributing to an organism's metabolism, growth, or other functioning, often includes: amino acids, fatty acids, vitamins, and minerals.
• State the problem. • Form a hypothesis. • Design and conduct experiments to test the hypothesis. • Make observations and collect data. • Draw conclusions based on results.
A subject or group of subjects in an experiment that in not exposed to the factor or condition being tested and which is used as a basis for comparison.