In 1857, what did the Supreme Court decide? A) that slaves in free states had the same rights as anyone else

B) that slaves are merely the property of their owners

C)that slaves could vote and serve on juries

D)that slavery must be abolished​

B.

Explanation:

This was decided in the Dred Scott case.

name two ways organisms join a population and two ways organisms leave a population. two ways organisms join a population are birth rate and immigration. two ways they leave are death rate and emigration.

explanation:

the effect of the ming leaders banning ships with more than two masts was that there was no further construction of ships masts, because there was a surplus. ming emperors disallowed foreign exploration