Which incidence rate most accurately represents the percentage of African Americans who are carriers of sicklecell anemia?

Which of the following does NOT have a role in determining when we sleep?

a) light and dark information b) body temperature c) digestion d) serotonin

At about ____ an infant's visual acuity is strong enough to discriminate facial features and emotions at further distances

a. 1 month b. 2–3 months c. 2 weeks d. 5–6 months