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No, they were not Toxic was actually poinsonous to the Anaerobic photoautotrophs. However cyanobacteria (a.k.a pondscum) is believed to be the first bacteria to give off oxygen as a by-product of photosynthetic processes.

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Q: Were the first organisms that released oxygen as a by-product of photosynthesis?
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Related questions

What is the waste product for plants of photosynthesis?

Oxygen is an important by-product (not waste) of photosynthesis and is needed by not only animals and other organisms, but also the plants which make it.


What does photosynthesis realese?

The main byproduct of photosynthesis is oxygen.


What processes produce oxygen?

oxygen is a byproduct of photosynthesis in plants


Does osmosis primarily release oxygen into the atmosphere?

No, photosynthesis. Oxygen is a byproduct of photosynthesis.


What is the byproduct of photosynthesis?

Oxygen is the by-product of photosynthesis. Glucose and oxygen are the final products of the photosynthesis process.


What substance is the byproduct of photosynthesis?

oxygen is the byproduct of photosynthesis because from water (H2O), sunlight and carbon dioxide (CO2) , they release oxygen to make glucose.


In what process is oxygen produced as a byproduct?

photosynthesis


What chemical is a byproduct of a photosynthesis?

Oxygen and Glucose


Oxygen was introduced into the atmosphere as a byproduct of?

The source of oxygen in the atmosphere is a complicate stellar process.


Where does the oxygen for cellular respiration come from?

Large quantities of oxygen are dissolved in water and make up a large percentage of air. Organisms extract it from these media. The ultimate source of molecular oxygen in the air and water appears to be as a byproduct of photosynthesis in plants and some single-celled organisms.


What substance is the byproduct of the photosynthesis chemical equation?

oxygen is the byproduct of photosynthesis because from water (H2O), sunlight and carbon dioxide (CO2) , they release oxygen to make glucose.


What is the name of Gas that is released into the air as byproduct of photosynthesis?

It's called oxygen. Very handy stuff if you are into breathing.