Which of the following recent studies casts doubt on the facial feedback hypothesis? A woman with a paralyzed face still responds emotionally to slides meant to
stimulate emotions.
A blind woman still responds emotionally to slides meant to stimulate emotions,
A woman paralyzed from the waist down still responds emotionally to slides
meant to stimulate emotions.
A woman with Down syndrome still responds emotionally to slides meant to
stimulate emotions

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity hurry!

Acertain species of fish can have either long or short fins. the allele for long fins is dominant over the allele for short fins. a heterozygous, long-finned fish is crossed with a homozygous, short-finned fish. of the offspring, will have long fins and be , and will have short fins and be .