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Bacteria (Bacterium) Definition - Microscopic unicellular plant lacking chlorophyll and fully defined nuclei. They occur in three main forms: Spherical (coccus), rod-shaped (bacillus), and spiral (spirilla). They occur in water, soil, organic matter or living bodies of plants and animals, being saprophytic (absorbing), parasitic (living in or one), and autotrophic in nutrition.
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