Well in the population from births and death it’s often combined and referred as natural increase or change, populations grow or shrink depending on if they gain people faster than lose them.
I believe the biosphere is fragile, because over time all of the pollution us humans have made; If its from air pulloution, acid rain or even water pollution. the toxic acids over time have made the biosphere and the ozon layer weaker and more thin. which causes the biosphere to become weaker.
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This is most likely not the answer you're looking for, but I believe the main function of any organism's reproductive system is to reproduce.
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