What was the major point learned in the 1991 Biosphere 2 experiment?
A. We should focus on recycling waste and wastewater.
B. We should learn how to grow a rainforest in an enclosed area for life support.
C. We must be aware that CO2 recycling is really difficult.
D. We cannot engineer life-supporting systems as well as those provided by nature.
E. We must admit that extinction is inevitable.
Answer: D
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Planetary scale flow such as trade-winds are best classified as:
A) synoptic. B) microscale. C) macroscale. D) mesoscale.
The conversion of citrate to isocitrate in step 2 of the citric acid cycle involves which of the following sequences of reactions?
A) dehydration followed by hydration B) hydration followed by dehydration C) oxidation followed by reduction D) reduction followed by oxidation
Most of the 80% of animals that live on land are ________
A) fish B) insects C) cattle D) horses E) birds
Of the two linked carbon cycles, the "slow" cycle is driven by _______ and the "fast" cycle is driven by _______ energy.
Fill in the blank(s) with the appropriate word(s).