Respuesta :

skyyang

Answer:

cyanobacteria

cyanobacteria  is The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen

Explanation:

Hope this helps:)

annika1grace

Answer:

Plants

Explanation:

Plants do photosynthesis which releases oxygen gas as a by-product.

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