Bacteria came in 1977 when Carl Woese recognised that archaea have a separate line of evolutionary descent from bacteria. This new phylogenetic taxonomy depended on the sequencing of 16S ribosomal RNA, and divided prokaryotes into two evolutionary domains, as part of the three-domain system. Bacteria Bacteria (; common noun bacteria, singular bacterium) 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
Flora and fauna of Karachi plants is "flora". Flora, fauna and other forms of life such as fungi are collectively referred to as biota. Also crows, pigeons, doves, sparrows, parrots, hawks, eagles and seagulls. Flora and fauna of Karachi The flora and fauna of Karachi, Sindh, Pakistan. Flora is the plant life occurring in a particular region or time, generally the naturally occurring or indigenous—native plant life. The corresponding term for animal life is fauna. "Flora", "fauna" and other forms of life such as fungi are collectively referred to as biota. Bacterial organisms, algae, and other organisms are sometimes referred to as flora, so that