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1st
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Atom:Basic unit of matter.
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2nd
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Molecule:Smallest unit of most compounds.
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3rd
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Cell:Basic unit of all forms of life.
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4th
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Tissue:Group of similar cells that perform a function.
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5th
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Organ:Group of tissues that work together to perform closely related functions.
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6th
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Organ System:Group of organs that work together to perform a specific function.
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7th
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Organism:Individual animal, plant, or single-celled life form.
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8th
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Population:Group of individuals of the same species that live in the same area.
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9th
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Community:Different populations that live together in a defined area.
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10th
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Ecosystem:All organisms that live in a particular place together w/ their nonliving environment.
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11th
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Biome:Group of ecosystems w/ same climate and dominant communities (dominant communities = main/prominent groups of different populations living together)
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12th
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Biosphere:Parts of the planet in which life can exist (including land, water, air, and atmosphere)
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