Question

1. select the organism responsible for the great oxidation event photo - actins plants photosynthetic crustacean cyanobacteria clear all

Explanation:

The Great Oxidation Event was caused by cyanobacteria. These prokaryotic organisms were the first to perform oxygen - producing photosynthesis, which led to the significant increase of oxygen in Earth's atmosphere. Photo - actins are not real organisms related to this event. Plants evolved much later. Photosynthetic crustaceans also evolved long after the Great Oxidation Event.

Answer:

D. Cyanobacteria