Susan trained her rat to press a bar in a skinner box in order to get a food pellet. susan's rat pressed the bar a lot. however, later when susan ran out of food pellets, her rat eventually stopped pressing the bar. what had happened?

Which best describes the scientific process

Astudent drew the following flowchart to show the movement of nutrients. soil → roots → plants →? where does nitrogen go next? a. directly into nearby animals as nutrition b. directly into aquifers through condensation c. directly into the air through evaporation d. directly into nearby plants during fixation

Which of the following are responsible for sending messages from the hypothalamus to the thalamus?