Jack is 6 years old, but does not communicate with speech, is not able to interact with other children, does not engage in normal forms of social play, and seems caught up in his own internal world. The most likely diagnosis for Jack is:

What is the principle that indicates that after about 50 doublings, cells lose their ability to replicate?

a. Hayflick limit b. cell limit c. replication limit d. HELA limit

The use of serotonin reuptake inhibitors to treat paraphilias is based on the theory that paraphilias may be a

A) type of obsessive-compulsive disorder. B) form of depression. C) variant of post-traumatic stress disorder. D) sexual addiction.