I was doing a test and came across a task like this:
 Cornfields with a more _____ insect population have fewer problems with pests
 A) diverse B) various
 What's the difference between these words?

 

A) "diverse" is the correct option.

We don't say "more various" because "various" means "several different". "Diverse" means dissimilar or consisting of dissimilar components.

a more diverse insect population = an insect population that has a greater diversity

diversity 有生物多样性的意思，  more **  更丰富的生物
various 是有几种不同的生物的意思。 more 。。更多的几种，这种说法是错误的，