Which of the three key environmental requirements for life might Europa possess?
A) a source of elements and molecules from which to build living organisms
B) a source of energy for metabolism and growth
C) a liquid medium for transporting the molecules of life
D) all of these
Question 2
Which of the following statements about quantum tunneling is true?
A) It is used in modern electronics, and, in fact, our modern-day computers would not work without it.
B) It plays a crucial role in nuclear fusion in the Sun.
C) It allows electrons and other subatomic particles to pass through wall-like energy barriers even when it seems they do not have enough energy to get through the barriers.
D) Although it has been observed to occur, it violates all other known laws of nature, and explaining it therefore represents a major challenge to physicists.
E) A, B, and C are true, but D is not
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