A mutualistic and A a decrease in the number of corals
Answer:
Oil
Explanation:
Since, unlike oil, source like wind, solar, water etc. come naturally we don't and can't replace them but when the viscosity in oil has been used up it must be change to allow the proper functioning of the machine.
Answer:
Even though it can be undone, a new product is formed in photosynthesis. So it's a chemical process
