Not sure if this is true, but I think it should be natural disasters.
Photosynthesis produces oxygen gas by the reaction of sunlight and carbon dioxide. Every living thing living in an ecosystem requires oxygen to breathe and to survive.
I think the answer is DNA
The answer is (A. A warm current flows along the coast.) Currents carry cold and warm water from place to place. It's an amazing phenomenon that scientists are still trying to fully figure out. Some think it's caused by wind, others think it's caused by the shifting of the tectonic plates, but one thing's for sure, currents are VITAL for this planets life.
