13. How do mycorrhizae influence plants? A. By absorbing nutrients and water and transfer them to plants
B. As an invasive fungi, it competes with roots for space.
C. They're a type of pathogenic fungi that cause root rot.
OD. Using a symbiotic fungi that fix nitrogen

Explanation:

Their major role is to enhance nutrient and water uptake by the host plant by exploiting a larger volume of soil than roots alone can do. ... The ability of mycorrhizae to improve host plant nutrient and water acquisition and to help in defense of root pathogens and root grazing can alter the host plant performance.

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the organisms are not adapted to live in some communities or habitats.