d) Organisms tend to over populate their environment and this overpopulation forces the offspring to compete for the limited resources necessary for survival and reproduction.
(this overpopulation; forces; the offspring; to compete for the limited resources necessary for survival and reproduction) (the offspring; to compete; for the limited resources necessary for survival and reproduction)
this overpopulation the offspring
forces to compete
the offspring to compete for the limited resources necessary for survival and reproduction
for the limited resources necessary for survival and reproduction