↑ Science
Biology is the study of life and living organisms.
- It examines how organisms interact with each other and their environment.
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Bio = life
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logy = study of
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So, biology literally means "the study of life."
The characteristics of life
- All living things share eight characteristics
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Made of cells (unicellular or multicellular);
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Reproduce (asexual or sexual);
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Based on a universal genetic code (DNA);
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Grow and develop;
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Obtain and use energy (metabolism);
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Respond to stimuli (environmental response);
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Maintain a stable internal environment (a.k.a. homeostasis);
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Evolve as a group over time (evolution).
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The levels of life
- From smallest to largest
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Atom
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Molecule
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Organelle
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Cell
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Tissue
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Organ
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Organ system
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Organism
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Population
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Community
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Ecosystem
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Biosphere
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Universe
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Types of Biology studies
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Zoology: Study of animals.
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Botany: Study of plants.
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Ecology: Study of ecosystems.
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Microbiology: Study of microscopic organisms.
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Genetics: Study of genes and heredity.
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Anatomy: Study of body structure.
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Physiology: Study of body function.
