What percentage of preterm and low-birthweight births are unexplained with regard to cause?

The encoding-specificity principle suggests that

a. we recall something better if we are in the same context in which we originally learned the material. b. we recall something better if we are in a context that is moderately different from the original learning contextâ€"not too similar, and not too different. c. recall depends upon how specific the instructions are; vague instructions lead to poor recall. d. it is more effective to encode material during learning than to decode the material during recall.

After age 8, girls __________ than boys

A) are slightly shorter and lighter B) have slightly more muscle C) have slightly less body fat D) begin accumulating fat at a faster rate