Why is it important for all countries to participate in reducing resource depletion? a. resource depletion that occurs in one country may be due to demand in another. b. the depletion of resources in one area can have a dramatic effect on other regions. c. resources are limited globally. d. all of the above

D. All of the above.  

the answer is D on e2020

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

not sure if this is what you'r looking for nnew= nold