<answer>Bacteria</answer> (i/bækˈtɪəriə/; singular: bacterium) 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. <answer>Bacteria</answer> were among the first life forms to appear on Earth, and are present in most of its habitats. <answer>Bacteria</answer> inhabit soil, water, acidic hot springs, radioactive waste, and the deep portions of Earth's crust. <answer>Bacteria</answer> also live in symbiotic and parasitic relationships with plants and animals. They are also known to have flourished in manned spacecraft.
What is a large domain of prokaryotic microorganisms?
Bacteria