Wastes, oxygen, and antibodies are exchanged between the mother and embryo through the

While Sid is sitting at his desk at work, an image of harming his young son pops into his mind. Each time this occurs, he touches all four corners of his desk in a particular order. Sid probably suffers from

a) agoraphobia. b) panic disorder. c) generalized anxiety disorder. d) obsessive-compulsive disorder.

The use of drugs can produce a ___________ addiction where people grow to depend on drugs to cope with the everyday stress of life

a. mild c. psychological b. powerful d. psychosocial