Which is a problem associated with a declining population size ?

a. scarce food supplies
b. limited health care
c. an aging population

hurry

i am going to guess that it is co2.

cell regulation is conducted by special proteins.

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.