Answer:
True
Explanation:
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. Most bacteria have
not been characterised, and only about 27 percent of the bacterial
phyla have species that can be grown in the laboratory. The study
of bacteria is known as bacteriology , a branch of microbiology .
