Which best contrasts electric doorbells and audio speakers? O Doorbells involve rapid changes in the direction of current, and speakers do not.
O Speakers involve rapid changes in the direction of current, and doorbells do not.
O Doorbells require closed circuits in order to work, and speakers do not.
O Speakers require closed circuits in order to work, and doorbells do not.
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How do you date a sample of rock that you suspect as being one of the earliest on earth

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?

Apuppy’s tendency to chew is inherited through which of the following? a. through learned behavior b.through genes c. through seasonal cycles d. through hibernation