How do some scientists believe that early people crossed a land bridge
and made it to North America ?

It is widely believed that early eurasian people crossed a land bridge where the Bering strait is today between Alaska and Russia. These people eventually became Native Americans.

the answer is d. party organizers, volunteers, voters and elected officials.

yes based on alexanders actions he deserved the title of "the great". his empire covered about 3,000 miles and he was able to establish the empire over a 13 year period of time. he was able to conquer many different places. he also defeated the persians. he conquered egypt and developed a city and named it after himself.