A child starts to cry after she sees her best friend trip and scrape her knee. The child's behavior is most likely an example of

According to a study conducted by three different research institutions in 2012, people who carry only one copy of the gene ________ experience significantly greater feelings of happiness

a) phenyl ketonone (PKO) b) ethylene diamine tetra-acetone (EDTA) c) monoamine oxidase A (MAOA) d) acetyl salicylic acid (ASA)

A person with red-green color blindness will see the world in ________

a) blacks, whites, and grays b) muted reds and greens c) blues, yellows, and grays d) yellows, greens, and grays