How many domains are recognized today?

a domain made up of prokaryotes that can live in extreme environments

a kingdom of mostly single-celled or simple multicellular organisms

For hundreds of years, how were all living things classified?

a kingdom made up of complex, multicellular organisms that lack cell walls, can usually move around, and respond quickly to their environment

a domain made up of prokaryotes that live in soil, water, and in the human body

What happened that made it necessary for scientists to add new domains and kingdoms?

a kingdom of nongreen, eukaryotic organisms that do not move and that reproduce by spores

a kingdom of complex, multicellular organisms that are usually green, have cell walls, and us photosynthesis

Mrs. Parkerson learned to classify living things just by plants or animals

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