Why is hand washing the focus of public health interventions? a. it keeps you from contracting any respiratory illnesses. b. it is an effective treatment for many contagious diseases. c. it removes every pathogen so they will not be transmitted. d. it prevents many infectious agents from entering your body.

Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.

Lupe is a carrier for color blindness. her husband clifford is colorblind. if lupe and clifford have four children, what's the probability of a boy being colorblind?

What do genes contain the code for?