Microcystis aeruginosis is a freshwater photosynthetic cyanobacterium. When temperatures increase and nutrients are readily available in its pond habitat, M.
aeruginosis undergoes rapid cell division and forms an extremely large, visible mass of
cells called an algal bloom. M. aeruginosis has a short life span and is decomposed by
aerobic bacteria and fungi. Identify the metabolic pathway and the organism that is
primarily responsible for the change in oxygen level in the pond between times I and
II. Remember to use complete sentence(s).