Included are Algae, Amoebas, Paramecia. Included are Yeasts, Molds, Mushrooms. The Nature of Science. A theory can become a principle or law. Thus a scientific theory is one that has been subjected to and passed rigorous examination by competing scientists.
Science is a dynamic and ongoing process of reexamination and seeking new information.
Science evolves, as it were. B. All Organisms Obey Laws of Physics and Chemistry. All Organisms Require Energy. Energy can change from one form to another, but cannot be created or destroyed. All natural events proceed in such a way that concentrations of energy tend to dissipate or become random.