Oxygen first entered earths atmosphere when one called organisms resembling modern cyanobacteria began to carry out the process of what

             Cyanobacteria were the first autotrophic organisms to evole in this universe.  They are also known as blue green algae and contain photosynthetic pigments which carried out the process of photosynthesis and produce oxygen as a by products. In the begining the level of oxygen was not enough to form a part in the atmosphere. As cyanobacteria stared their life cycle the level of oxygen increased to 21%.

Ifound this on google “interphase is divided into three phases: g1, s, and g2. the subsequent mitotic (m) phase consists of two processes: mitosis, the process of nuclear division, and cytokinesis, division of the cell's cytoplasm. each mitotic phase results in the formation of two cells that are genetically identical to the parent. for more information go to the web down below cyberbridge.mcb.harvard.edu › mitosis_3i hope this you for what your looking for.can you plz mark me brainliest?

C14 dating since carbon is present in both living and no living objects .