Introduction to Biology and Life Processes

Biology is the study of life and living organisms. All living things share common characteristics:

they are made of one or more cells, use energy, maintain homeostasis, grow and develop,

reproduce, respond to stimuli, and evolve over time. Life is organized

in levels, beginning with atoms and molecules and building up through cells,

tissues, organs, organ systems, organisms, populations,

communities, ecosystems, and finally the biosphere. Scientists study

biology using the scientific method, which involves asking questions, researching,

forming hypotheses, running experiments, collecting data, and communicating results.