Question

Both have no direct relationship but a free efficient expression binds them what are they

Answer 1

I think human maybe it can be

Answer 2

I think this is a tricky question ,it is so brief but i think there are so many ,organisms ,species or other things that do not have direct relationship but exists mutually and by that they can be said to have an efficient expression

For instance plants and animals do not have any direct relationships they are different species but they exist mutually