very tiny and simple plants, so small that they can usually be seen only through a microscope. Certain bacteria
cause diseases such as
pneumonia and
typhoid fever; others do useful things, such as turning cider into
vinegar.
very tiny and simple plants, so small that they can usually be seen only through a microscope. Certain bacteria
cause diseases such as
pneumonia and
typhoid fever; others do useful things, such as turning cider into
vinegar. Bacteria consist of
single cells that are rod-shaped, spherical or spiral.