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What is it?
Bacteria are a type of biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a number of shapes, ranging from spheres to rods and spirals. Bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep biosphere of the earth’s crust. Bacteria also live in symbiotic and parasitic relationships with plants and animals.
Give me some examples
Eshcerichia coli, Streptococcus, Clostridium perfringens, Staphylococcus aureus, Cyanobacteria, Proteobacteria, Chlamydiae, Spirilla, Vibrio, Heliobacter, Trepenoma pallidum
What does it look like?
IMAGE SOURCE: Creative Commons