The first photosynthetic organisms to obtain hydrogen by splitting water were the cyanobacteria.

Question

Quizplus · Accepted Answer

Cyanobacteria were the first organisms to perform oxygenic photosynthesis, which involves splitting water molecules to obtain hydrogen for the photosynthetic process, releasing oxygen as a byproduct. This process significantly altered the Earth's atmosphere and led to the proliferation of aerobic life forms.

The First Photosynthetic Organisms to Obtain Hydrogen by Splitting Water