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Re: Rainwater contains hydrogen of a heavy form called deuterium. The [#permalink]
GK002 wrote:
How in the world is this Q classified as low difficulty? I eliminated all the answer choices because I couldn't identify one that clearly explains the two differences.

Difference 1: Rainwater in OLD trees have more Deuterium than today's trees
Difference 2: Rainwater in OLD caves have less deuterium than rainwater today

How does D reconcile these two??

­I know this is late but I agree. It's the SAME water. 
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Re: Rainwater contains hydrogen of a heavy form called deuterium. The [#permalink]
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woahsun wrote:
GK002 wrote:
How in the world is this Q classified as low difficulty? I eliminated all the answer choices because I couldn't identify one that clearly explains the two differences.

Difference 1: Rainwater in OLD trees have more Deuterium than today's trees
Difference 2: Rainwater in OLD caves have less deuterium than rainwater today

How does D reconcile these two??

­I know this is late but I agree. It's the SAME water. 

­On the contrary, D is establishing that it may NOT be the same water. The trees may have grown at the same time that the caves formed, but D is saying that the trees used CURRENT water, but the water in the caves may be older than the caves themselves. Therefore, the water that formed the trees and the water in the caves may be from different eras, so there's no mystery in their having different deuterium levels. 
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Re: Rainwater contains hydrogen of a heavy form called deuterium. The [#permalink]
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