Dr. garcia is known for his difficult pop quizzes. immediately before he springs a pop quiz on his students, he typically goes to the classroom door and closes it, and his students begin to feel anxious and tense. students soon learn to anticipate a pop quiz and feel anxious whenever dr. garcia closes the classroom door. closing the door has become a(n): choose the correct answer from the following choices, and then select the submit answer button. a) conditioned stimulus. b) unconditioned stimulus. c) unconditioned response. d) conditioned response.

The correct answer is a) Conditioned Stimulus.

Explanation:

In classical conditioning a Conditioned Stimulus can be understood as an stimulus that was previously neutral gets associated with a unconditioned response eventually elicits a conditioned reponse.

In this particular case, Dr. Garcia closes the door everytime before he proceeds to do a pop-quiz to his students. Because the pop-quiz tend to elicit an unconditioned response of fear in students, the slamming of the door becomes associated with it.

As soon as the students hear the door, they anticipate the anxiety of the test.

In conclusion, closing the door has become a conditioned stimulus.

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giant impact theory - the moon was formed from the collision between earth and another mars-sized body.

colliding planetesimals hypothesis - the moon was formed from the same cloud of material as earth.

capture hypothesis - the moon was locked into orbit by earths gravity as it was passing by it.

accretion hypothesis - the moon was formed from collisions and combining of planetesimals.

i think this is right, if not and you know better let me know.