Vance understands why rainfall amounts affect different types of vegetation positively and others negatively. vance is demonstrating

Vance is demonstrating conceptual knowledge

Conceptual knowledge is the clear and detailed understanding of principles, concepts, models or theories and the understanding of the linking relationships between them. Conceptual knowledge is acquired by thoughtful, reflective learning, listening, reading, or viewing. From the question, Vance is demonstrating conceptual knowledge because he has the explicit understanding of why rainfall amounts affect different types of vegetation positively and others negatively.

i think the answer is

mass