PT155.S1.Q23 > Question

SECTION 1 · lr

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SECTION 2 · lr

SECTION 3 · rc

PASSAGE 1

Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

PASSAGE 2

Question 8 Question 9 Question 10 Question 11 Question 12 Question 13 Question 14 Question 15

PASSAGE 3

Question 16 Question 17 Question 18 Question 19 Question 20 Question 21 Question 22

PASSAGE 4

Question 23 Question 24 Question 25 Question 26 Question 27

SECTION 4 · lr

The author concludes that life is unlikely to have occurred on Mars. This is because on Earth, biological activity leads to a change in the ratio of S-34 to S-32. But in a meteorite from Mars, we only see ratios of S-34 to S-32 that we see in Earth rocks dating from before life on Earth.

The author assumes that life on Mars would lead to a similar change in S-34 to S-32 ratio as observed on Earth. The author also assumes that the ratio in the Martian meteorite is representative of Mars generally. In addition, the author assumes that the Martian meteorite did not leave Mars before life could have arisen on Mars.

This raises the possibility that life on Mars would lead to an S-34 to S-32 ratio that isn’t the same as what we observe on Earth.

This strengthens the argument by making the Martian meteorite representative of Mars rock as a whole with respect to the S-34 to S-32 ratio.

This points out that even many Earth rocks don’t have a ratio that reflects life. This raises the possibility that the Martian meteorite, even if it doesn’t have ratio that reflects life, doesn’t rule out the possibility of life on Mars.

This raises the possibility that life might have arisen after the meteorite left Mars. Perhaps the ratio of S-34 to S-32 on Mars today does reflect life, even if the meteorite we discovered does not have that ratio.

PrepTest 155 - Section 1 - Question 23

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