Because there is no water there so they are losing the water they need and are becoming dehydrated therefore they die and their bodies get buried in the sand if they just lay there and if they are not carried to shade and if they don’t have water
I believe it is they are reactants because they’re present before the reaction. O2 and glucose are reactants in the cellular respiration process. The product is ATP
If you mean a specific system then the reproductive system...but i haven't the slightest idea as to anything else to do with your question...
