What factors caused the Greeks to be known as reliable navigators

At any one time in the year at any one point on the globe, the sun and stars are found above the horizon at certain fixed heights at a distance that mariners can measure with as simple an instrument as one's fingers, laid horizontally atop one another and held at arm's length.

1) the answer is b

senators serve a six-year term; representatives serve a two-year term, making them more responsive to (and responsible for) voter confidence.

2) the answer is d

to serve as president, one must:   -be a natural-born u.s. citizen of the united states;   be at least thirty-five years old;   be a resident in the united states for at least fourteen years.

3) the answer is a

ella,because it is constitutionally eligible

4) the answer is c: the u.s president

it maybe, we dont know. however lucky the lipercon seams guilty