Which of the following describes a response to external stimuli?

a rabbit runs away from a fox that is chasing it

a woman drinks water when she is thirsty

a boy eats food when he is hungry

a person yawns when oxygen levels in the blood are low

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano.the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? positive force → balanced force → negative force negative force → balanced force → positive force positive force → unbalanced force → negative force negative force → unbalanced force → positive force