Which of the following statements about the phospholipid bilayer is TRUE? a. The tail of the phospholipid molecule is hydrophilic.
b. The head of the phospholipid is hydrophilic.
C. The head of the phospholipid is not polar.
d. The tail of the phospholipid is attracted to water.

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?

Which description provides the best objective summary of the article in the passage?

Identify two examples of chemical reactions that you have encountered during the last week. identify an exothermic and endothermic reaction. explain.