Question

believed that the exploration of knowledge should be grounded in that which is physically testable socrates plato aristotle alexander

Explanation:

The description about the exploration of knowledge being grounded in physically testable things is related to Aristotle's philosophy. Aristotle emphasized empirical observation and the study of the physical world for knowledge, unlike Plato (more idealism) or Socrates (focus on dialogue/ethics). Alexander is not known for this epistemological view.

Answer:

Aristotle