Europa is one of Jupiter's moons. Its surface is covered with frozen water. It is far from the sun and has only a very thin atmosphere, so its surface is considered to be too cold to support life. Beneath the ice, there are probably liquid oceans rich in oxygen, kept warm by heat that escapes from Europa's core. Image courtesy of the NASA/Goddard Space Flight Center Scientific Visualization Studio

Which of the following facts supports the idea that life could exist on Europa?
A.
On Earth, most producers get their energy from sunlight and form the base of entire food webs.
B.
On Earth, deep sea fish attract prey with light that is given off by their bodies.
C.
On Earth, penguins live and breed in the coldest part of the Earth—Antarctica, on the southern polar ice cap.
D.
On Earth, whole ecosystems exist deep in the ocean that use volcanic vents, not sunlight, as a source of energy.

D.

On Earth, whole ecosystems exist deep in the ocean that use volcanic vents, not sunlight, as a source of energy.

Explanation:

D. makes the most sense out of all of them. Essentially the text is saying that life could exist beneath the surface of Europa. "Beneath the ice, there are probably liquid oceans rich in oxygen, kept warm by heat that escapes from Europa's core." D states that life exists on earth in similar places to the one on Europa.

Hope this helps! :-)

i think they came to washington to protest

the correct answer option is: weapons.

explanation:

tensions rose as the two opposing superpowers competed for 'weapons'.

referring to the cold war (1945-1991), the two superpowers, usa and ussr, experienced a phase of struggle and conflict with each other. these two superpowers considered each other as a threat to their survival and thus opted for policies to strengthen their positions.

the two superpowers never went to war with each other directly but competed for weapons to preserve their positions.