Bacteria are:Single choice

a. Eukaryotic organisms that possess a nucleus and intracellular structures. They are important for the decomposition of organic matter.

b. Acellular entities that are composed of a nucleic acid and a few proteins. They are very small and can't be seen with a light microscope.

c. Eukaryotic, single-celled microscopic organisms. They possess at least one nucleus and numerous intracellular structures.

d. Single-celled prokaryotic organisms that do not contain a nucleus and lack membrane-enclosed intracellular structures

e. Multicellular, eukaryotic animals. They generally possess digestive, circulatory, nervous, excretory, and reproductive systems.