in the seventeenth century, the earliest british colonies in virginia were saved from economic ruin by:

The introduction of tobacco cultivation

Explanation:

In 1614, the Virginia colony began exporting tobacco back to England, which earned it a sizable profit and saved the colony from ruin. A second tobacco colony, Maryland, was formed in 1634, when King Charles I granted its charter to the Calvert family for their loyal service to England

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.

question 10: the answer is c, to their constituents address a problem.

question 11: i think it would be domestic bills, which deal with american issues only and public bills, which affect the whole nation.