Which process or element was present first?

A) aerobic respiration
B) chloroplasts
C) mitochondria
D) fungi
E) photosynthesis

Photosynthesis is believed to have evolved first among the options listed. Chloroplasts, which are necessary for photosynthesis to occur, are also believed to have evolved from photosynthetic bacteria. Mitochondria, which are involved in aerobic respiration, are believed to have been derived from an endosymbiotic event between aerobic bacteria and eukaryotic cells. Fungi evolved later than these processes and elements.