Researchers have calculated the vast majority of personality heritability estimates based on self-report or parent-report questionnaires

If a child is having a great deal of trouble learning to read, and if you wanted to encourage him in the development of positive self-esteem, the best way you might do this is to:

a. punish him when he makes reading mistakes b. make sure he works on his reading homework before he is allowed to do something more fun c. keep telling him he is a good reader, even though he isn't d. have him get involved in something he is good at, such as music or sports

At 20 months, Katy says "pah-getty" (spaghetti) whenever

she wants to eat and says "milk" when she wants something to drink. She also calls her mother "Mama" and her father "Dada" and her cat "Kitty." Katy is most likely in the which stage of language development? a. cooing b. babbling c. telegraphic d. single-word