Which of the following statements regarding contraceptives is incorrect?

A) the rythym method tracks the female menstrual cycle to determine least fertile points in the cycle

B) use of spermicidal products kills or inactivates sperm and any sexually transmitted pathogens to prevent fertilization and disease

C) use of barrier methods prevents entry of sperm into female reproductive tract

D) hormonal oral birth control pills work to prevent ovulation by controlling hormones

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.