"a major function of structure x is to
(1)produce gametes by meiosis
(2)protect the fetus from physical injury
(3)exchange materials between the mother and the fetus
(4)store food to provide the fetus with nutrient"

Why does competiton happen? a: different organisms have different needsb: there are limited resources in an ecosystemc: there are no predators in an ecosystemd: organisms do not need the same resources (i think it's b but i'm not sure)