According to one theory, how did the earliest people come to the americans?
a-african tribesmen sailed large ships to the caribbean islands.
b-europeans traveled across a land mass that connected europe and north america.
c-native americans migrated to asia and brought others with them when they returned.
d-southeast asians sailed across the pacific ocean to north america.

answer; ///i believe that the correct answer is (a) the great depression

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.