Respiration requires the presence of this gas: ________
Fill in the blank(s) with the appropriate word(s).
Answer: oxygen
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Which of these high-quality energy sources drives the majority of chemical cycling that takes place in natural ecosystems?
A. solar B. geothermal C. nuclear D. fossil fuels
The Earth’s mean global temperature has changed significantly over the course of our planet’s
history. Indicate whether the statement is true or false.
In the Southern Hemisphere,
a. air rises steeply ahead of a warm front, and gradually ahead of a cold front. b. cold, warm and occluded fronts are associated with high pressure systems. c. precipitation associated with warm fronts tends to be brief and intense. d. precipitation associated with warm fronts tends to be gentle and prolonged
Evidence from polar ice core analysis shows that, until now, global carbon dioxide levels have never exceeded ________ ppm in the last 800,000 years
A) 200 B) 25 C) 1000 D) 500 E) 300