Bacteria (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. 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 portions of Earth's crust. Bacteria also live in symbiotic and parasitic relationships with plants and animals. They are also known to have flourished in manned spacecraft. COUNT 5
QSN1 What is a large domain of prokaryotic microorganisms? ANS1 Bacteria QSN2 What configurations can bacteria can bacteria take? ANS2 spheres to rods and spirals QSN3 When is the typical lenght  for bacteria? ANS3 few micrometres QSN4 What environments can bacteria live? ANS4 present in most of its habitats QSN5 What is the relationships between plants animals and bacteria? ANS5 symbiotic and parasitic relationships