Exploration of antarctica’s interior did not begin until
a) tractors were brought to the continents

b)sailors from european countries landed on pack ice

c)a treaty was signed by 12 nations

d)airplanes were strong enough to withstand the winds and cold

when in doubt choose c

it's what my teacher told my class when we were going into psats

in mcculloch v. maryland (1819) the supreme court ruled that congress had implied powers under the necessary and proper clause of article i, section 8 of the constitution to create the second bank of the united states and that the state of maryland lacked the power to tax the bank.

gibbons v. ogden, (1824), was a landmark decision in which the supreme court of the united states held that the power to regulate interstate commerce, granted to congress by the commerce clause of the united states constitution, encompassed the power to regulate navigation.