If sub means below and co means with and it’s means order what’s the difference between to coordinate and to subordinate

Coordination and subordination are two ways of combining sentences. Coordination means combining two sentences or ideas that are of equal value. Subordination means combining two sentences or ideas in a way that makes one more important than the other.

you didn't list the options but im guessing it's resolving contradictions

the answer that is correct is the last option.