Question

if the number of photosynthetic organisms on earth decreased drastically, which would happen as a result? less water would be available on earths surface. less solar energy would reach earths atmosphere. more oxygen gas would be found in earths atmosphere. more carbon dioxide gas would be found in earths atmosphere.

Explanation:

Photosynthetic organisms use carbon - dioxide, water and solar energy to produce oxygen through photosynthesis. Fewer photosynthetic organisms mean less carbon - dioxide is taken in for photosynthesis, so more carbon - dioxide would be in the atmosphere. Also, less oxygen would be produced. Solar energy reaching Earth's atmosphere is not directly affected by the number of photosynthetic organisms, and the amount of water on Earth's surface is not directly related to the quantity of photosynthetic organisms in this context.

Answer:

A. More carbon dioxide gas would be found in Earth's atmosphere