Which one of the following choices refers to the tendency to give our attention to unexpected noises or other stimuli and is part of our goal of self-preservation?

According to the article Zipping Up the Genes about twins reared apart, variance in scientific studies is

likely to be the result of differences between individuals studied and (a) error in measurement (b) careful control of studies (c) statistical analysis (d) all of these--a, b, and c--are correct

The notion that the nerves that branch out from the spinal cord and brain become less efficient with age is called __________

a) dendrite/axon theory b) peripheral slowing hypothesis c) generalized slowing hypothesis d) decreased myelination theory