Which substance is not released by plant roots to enable and improve access to particular nutrients in the soil?

Question

Quizplus · Accepted Answer

Plants release amino acids, carbohydrates, enzymes, and fatty acids from their roots to interact with the soil microbiome, enhance nutrient uptake, and modify the rhizosphere. However, carbon dioxide (CO2) is primarily a byproduct of respiration, not specifically released to improve access to nutrients.

Which Substance Is Not Released by Plant Roots to Enable