Answer:
Lower oxygen and higher carbon dioxide concentration in the atmosphere.
Explanation:
The initial outcome would be that more carbon dioxide will be present in the atmosphere with lower amount of oxygen.
The only means by which oxygen is replenish in the atmosphere is through photosynthesis while respiration leads to the production of carbon dioxide into the atmosphere. Photosynthesis use up some of the carbon dioxide in the atmosphere.
Hence, a reduction in the number of photosynthetic organisms on earth will lead to lower carbon dioxide being utilized and a reduction in the amount of oxygen being produced into the atmosphere.
