Just after the body dies, it immediately stops taking in needed oxygen. Does it at the same time immediately stop producing carbon dioxide?
A) Yes, because without the oxygen, carbon dioxide can no longer be produced.
B) Yes, because death means an immediate cessation of all body metabolism.
C) No, and without CO2 exhalation the pH of the blood decreases to very damaging levels.
D) No, and without CO2 exhalation the pH of the blood increases to very damaging levels.
C
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A 2-kg mass weighs 20 N and is suspended 2 m above the ground. Its potential energy relative to the ground is
A. 30 J. B. 40 J. C. 10 J. D. 4 J.
Coal replaced wood as industrialized countries' major energy source in the nineteenth century because
A. Wood is not as energy efficient as coal B. Wood supplies were diminishing C. Coal was easier to transport D. Coal was a cleaner fuel E. Early conservationists warned about the loss of biodiversity in the forests
Which statement about e-waste is accurate?
A. Electronic devices die easily, so few of the devices thrown out in the United States could be reused. B. E-waste is biodegradable. C. E-waste contains toxic heavy metals that can leach into the environment. D. There is no financial incentive to recycle e-waste.
Lake Chad, on the border of the Sahara Desert,
A. was originally a glacier that melted and so the water supply is dwindling. B. is a shrinking, shallow-water lake, depleted both by withdrawals for irrigation and by lack of recharge during a multi-decade period of declining rainfall. C. is a good analogy to Lake Erie, in that it has undergone extensive rehabilitation after being severely polluted and is now a healthy water source. D. is the last surviving deep-water lake in Africa and represents an important and stable water source for Chad, Niger, Nigeria and Cameroon.