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Bio 1A - Chapter 3 [Key Concepts]

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Key Concepts
Biologists categorize living organisms in three major ways: (1) the domains; (2) the Linnaean hierarchy; and (3) the tree of life
Key Concepts
Organisms can also be categorized according to their cellular structure, as either prokaryotes or eukaryotes
Key Concepts
Bacteria and Archaea are prokaryotes. they are the most numerous in terms of numbers of individuals, the most widespread, and the most diverse in methods of obtaining nutrients. They can act as producers, consumers, and decomposers.
Key Concepts
Protists are a diverse group of single-celled and multicellular organisms that can be animal-like, plantlikem or funguslike. One of the key innovations of the Protista was sexual reproduction. Some protists represent early stages in the evolution of multicellularity.
Key Concepts
Plants pioneered living on land. Plants evolved numerous evolutionary innovations, including seeds and flowers. Plants are producers; they provide the nutrients that amost all land-living consumers eventually use.
Key Concepts
Fungi have evolved a unique body plan that allows them to penetrate other organisms, digest their tissues externally for food, and then absorb that material. Fungi can be critical components of ecosystems, acting primarily as decomposers. Some fungi are mutualists with algae and plants. Some fungi are parasites.
Key Concepts
Animals are multicellular and range in complexity from sponges to mammals. Some key evolutionary innovations of animals include specialized tissues, organs and organ systems, complete body cavities, and an astounding range of behaviors. Insects (an animal group) are the most species-rich group of all organisms. Animals act mostly as consumers but also as decomposers.
Key Concepts
Viruses are not classified into any kingdom or domain.