All animals are
a) land-dwelling multicellular heterotrophs
b) capable of walking on legs
c) multicellular, heterotrophic and lack cell walls
d) unicellular or multicellular, heterotrophic and lack cell walls

answer; i believe its (ovulation);

just go with your heart buddy

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

i was thinking 4.0 v hope this