Alexis was diagnosed with obsessive-compulsive disorder because she has to check the locks on her house and car many times before she can leave them. Her therapist asks her to lock a door then takes away the keys so Alexis cannot lock the door again. Taking away the keys is and locking the door is .

Response prevention; exposure

Explanation:

Responsive prevention means preventing someone from a particular behavior.

Exposure is confronting one's fears repeatedly till the fear leaves or subsides

a. the moon was locked into orbit by the earths gravity as it was passing by and capture hypothesis i think