Demographic studies hope im right
Answer:
A lot of times it depends on the teacher. Ours didn't count but other teachers did count.
Lets say the plant that formed nodules is Species A, and the one who didn't is Species B.
If the nitrogen is concentrated in one area but at a low concentration, then Species A may have formed nodules because it is closer to the concentrated nitrogen. Species B didn't because the nitrogen that is active is being taken by Species A.
D. combined parenting leads to faster reproduction