The medieval scholar made almost no attempt to investigate the anatomy of plants, their mechanisms of growth, nor the ways where each was related to the other.
(A) nor the ways where each was related to the other
(B) nor how each was related to some other
(C) or the way where one is related to the next
(D) or the ways in which they are related to one another
(E) or the ways that each related to some other
I'll go with D here.
I think whenever we have a nor, there should be a neither before that:
Neither X nor Y. So A and B are both out.
C is out because "where" should be used to refer to location and plus the whole sentence is just awkard.
E is out because the construction of ways that related to some other is awkward. some other what??
D is a better choice because it clearly states the ways in which the plants are related to one another.
I'll second that (D) and add that "one another" is grammatically correct in showing interdependance within a group (planets)
BTW: In case you haven't heard, we are back down to 8 planets. Pluto has been put on a leash.