What was the name of a guy who did a gravity test and made up the theory of the universe?

Aman with a genetic disease marries a woman who does not carry the disease. it is not possible for their sons to have the disease. the disease. it is not possible for their so s to have the disease. the disease must be

What from the columbian exchange had perhaps the biggest impact on the world?

The u.s. constitution outlawed slavery. true false