Which of these are most likely homologous structures?

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4

The world wars of the twentieth century immediately led to a. the establishment of a communist bloc in eastern europe b. the urbanization of europe’s societies c. an emphasis on humanism d. an emphasis on ties to greek and roman societies select the best answer from the choices provided. a b c d

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