1. Bacteria (size - 1 um to 10 um) 1. Unicellular, independent / parasitic organisms. Sometimes many bacteria together form colonies. 2. Bacterial cell is prokaryotic with cell wall, but distinct nucleus or cell organelles are absent. 3. They reproduce by simple binary fission. 4. In favourable conditions, bacteria grow vigorously and can double their number in 20 minutes.
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answer in Wikipedia. check there . Good questions at toppr and brainly
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