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small organisms that drift and float in water


tiny living things that can be seen only with a microscope

characteristics of living things

organization, order (complex structure), metabolism, growth, responsiveness, adaptation, regulation, reproduction.


(microbiology) single-celled spherical or spiral or rod-shaped organisms lacking nuclei that reproduce by fission.


Unicellular microorganisms : . Like bacteria, archaea have no true nucleus; ., domain which consists of single-celled prokaryotes that have distinctive cell membranes and cell walls (Archaeabacteria)


kingdom of one celled organisms with a nucleus


package of nucleic acid wrapped in a protein coat that must use a host cell's machinery to reproduce itself


protein coat surrounding the nucleic acid of a virus


organisms that make their own food


eat dead organisms and recycle their nutrients back into the ground (bacteria and fungi)


an organism that lives on or in a host and causes harm to the host

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