What contributed did jonas salk make to science in the 1950s a. he invented ddt, the miracle pesticide b. he designed the first us satellite. c. he developed smaller computers. d. he created a vaccine against polio so much

During its history, france has been a kingdom, an empire, a colonial power and a republic. true or false

Hich explains why the constitution gave congress the power to create a system of federal courts? the constitution wanted congress to share power with the judicial branch. the constitution anticipated the need for courts lower than the supreme court. the constitution wanted congress to share power with the appellate courts. the constitution anticipated the need for courts equal to the supreme court.

Which physical feature minimizes population density in northern africa?