Question

which gas were cyanobacteria able to produce? carbon dioxide sulfur dioxide oxygen nitrous oxide

Explanation:

Cyanobacteria are photosynthetic organisms. Through photosynthesis, they use carbon dioxide, water, and sunlight to produce glucose and oxygen. This process is similar to plants. Carbon dioxide is taken in, not produced. Sulfur dioxide and nitrous oxide are not by - products of their normal photosynthetic process.

Answer:

oxygen