Answer:
c) Vascular system
Explanation:
The vascular system of a plant are the phloem and xylem.
The xylem is responsible for movement of water from the roots to the leaves while the phloem us responsible for translocating nutrient and sugars ( carbohydrate) produced by the leaves to other areas of the plants that need them for growth.
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.
Archaebacteria and Eubacteria, Protista and fungi
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