Behavior that violates established social norms or standards describes which of the following criteria for determining abnormal behavior?

At about what age does a significant loss of visual acuity begin to be measurable for most adults?

a. age 30 b. age 45 c. age 60 d. age 70

Your neighbor's 22-month-old son says the word "No!" fairly emphatically and quite a lot. Your neighbors were concerned that he might have oppositional-defiant disorder

Considering all that you know about toddler development, what do you think is actually happening? He is actually trying to say, "Go!" He likes to see how irritated he can make his parents. He has no idea of what the word "No" means. He says "No!" a lot because it reflects his budding sense of self.