Ultimately, positive and negative feedbacks on Daisy World lead to a system that perpetuates
A. a system exceeding positive or negative feedback limits.
B. further positive feedbacks.
C. further negative feedbacks.
D. a system that stays within certain limits.
Answer: D
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Most fresh water fish are hypertonic, meaning their body cells contain more salt than the surrounding water. Since osmosis should push water into their cells, why don't they explode?
a) They urinate a lot, so the water does not build up. b) They don't drink any water because they get so much from osmosis. c) Their cells have adapted to absorb salt. d) They have adapted to live with high osmotic pressure. e) All of the above
Nearly all of the oceans’ primary productivity occurs in the _____ zone
a. littoral b. photic c. pelagic d. benthic
cJudge the following sentence according to the criteria given below: Ancient volcanic calderas are a
particularly rich source of important metallic ores like copper, nickel, zinc, lead, and silver BECAUSE these dense heavy metals get left behind when the caldera explodes. a. The assertion and the reason are both correct, and the reason is valid. b. The assertion and the reason are both correct, but the reason is invalid. c. The assertion is correct, but the reason is incorrect. d. The assertion is incorrect, but the reason is correct. e. Both the assertion and the reason are incorrect.
Your instructor has an open door policy for office hours. This is an example of a(n) ________ type of policy.
A. Formal B. Tangible C. Intangible D. Informal E. Transitory