Our knees are a compromise that allow us to be bipedal. More recent ancestors of humans lost the ability to make vitamin C, but we figured out a way to solve this problem with a change in diet.

Question

*
cause/effect
compare/contrast
description
problem/solution
sequence

Answer 1

The relationship you've described can be categorized as problem/solution. The problem is that our recent ancestors lost the ability to produce vitamin C, which is essential for health. The solution was a dietary change that allowed humans to obtain vitamin C from alternative food sources.