Which of the following objects has polarity? A
the Earth, which has magnetic north and south poles

B
the city of Chicago, which has a North and Southside

C
a map of the country, which has a compass pointing north

D
an unmagnetized block of metal, which has a top and a bottom

How many liters of hydrogen gas will be produced at stp from the reaction of 7.179×10^23 atoms of magnesium with 54.219g of phosphoric acid (h3po4) the equation is 3mg + 2h3(> mg(po4)2+3h2

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

Will mark brainliest how many electrons can be held in the energy level n = 4?