Many children were paralyzed by polio in the 1950s. Today, polio has been reduced by 99 percent. Which statement best explains how this disease has been almost eradicated?
A) Independent behavior helps humans live self-sufficiently and solve their own problems.

B) human communities use their ecosystems in creative ways.

C) human communities are learning to live with less money and fewer possessions.

D) Group behavior helps humans cooperate in order to accomplish large, complex tasks.

Assume that a student is given two different models of bacteria, with one model consisting of big bacteria and the other consisting of small bacteria. how can the student demonstate the theory of endosymbiosis using the models

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?

What happens when a plant is losing too much water through transpiration? question 14 options: stomata open stomata close guard cells swell respiration increases