Problem: Given the question: Dan and Joe studied animals for biology class. Joe had to study predator animals, while Dan studied herbivores and grazers. Which student learned less about potential keystone species?
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The answer is:
Joe

Problem: Given the question: United States has varied geographical characteristics. Take for example, the Mississippi Delta. The delta has vast wetland that gets inundated every year. On the contrary, farther west, the Mojave Desert in Nevada sees very little precipitation or floodwater. Both places are beautiful in their own right, and attract many tourists every year. Which place would see more nitrification, Mississippi Delta or Mojave Desert?
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The answer is:
Mojave Desert

Problem: Given the question: John has been hearing about climate change for last couple of years. He wants to understand the science behind climate change. For that, he picked up two eras in earth's history, era A and era B. Era A was hundred thousand years ago, and era B is in the present day. He now wants to compare these to eras to understand the change in climate better. Would era A have more or less carbon dioxide in the air than era B?
++++++++++++++++++++++++++++++++
The answer is:
less