Judy gives a monkey a choice between a sphere and various other three-dimensional shapes. Each time the animal selects the sphere, it receives a grape; if it selects the other object, it receives nothing. Judy is engaged in .

concept training

Explanation:

Based on the scenario being described within the question it can be said that Judy is engaging in concept training. In the concept of Psychology, this term refers to when a researcher provides the subject certain objects in order for the subject to learn how to classify each object, by being shown examples and rewarded for making the correct distinction.

answer: a) a compound microscope has a greater magnification ability than a simple microscope.

explanation:

b. the carbon cycle ensures living things have a source of hydrogen