What is a climatic example of negative feedback?
A. Permafrost melts at a higher rate
B. Plants absorb carbon dioxide at a higher rate
C. Increased amounts of fossil fuel combustion
D. Increased amounts of volcanic ash in the atmosphere
Answer: B
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When work is done by a thermal system and heat is subtracted, the system's temperature
A. increases. B. decreases. C. remains unchanged. D. none of the above
The Aleutian Islands are the site of crust formation by a mid-ocean ridge. Indicate whether the statement is true or false
Mercury toxicity has been directly linked with which one of the following health problems in humans?
A. respiratory problems B. hepatitis C. neurological disorders and paralysis D. cancer E. digestive disorders
Which of the following occurs when DNA is transcribed to mRNA?
A) Both the exons and introns are transcribed in sequence. B) Both the exons and introns are transcribed, but their sequence is changed. C) Only the exons are transcribed. D) Only the intros are transcribed.