The most important difference between primary and secondary groups has to do with:

The most important difference between primary and secondary groups is that, primary groups are being referred to a family in which every person has while the secondary group is being referred to the society or the sociology class in which every person partakes to.This group has to do with the relationships that exist amongst them.

is this a question? wassup

more words for this could be abiotic and biotic

abiotic: living organisms within an ecosystem

biotic: non-living organisms within an ecosystem