Physical differences between geographic populations of modern humans
A) may have reached their present state by 20,000 years ago
B) reflect different patterns of local adaptation
C) reflect the effects of natural selection under varying environmental conditions
D) do not support the idea of biological races
E) all of the above
E
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An insurmountable barrier to entry can enable a firm to produce a quantity at which its ________ exceeds its ________ in the long run.
A) marginal cost; marginal revenue B) average total cost; price C) price; average total cost D) marginal cost; price
Which of the following is NOT true regarding potassium-argon and argon-argon dating methods?
a. The more argon-40 in a sample relative to potassium-40, the older the sample. b. They are as precise as radiocarbon dating. c. Their maximum age range is theoretically the age of the earth. d. They are useful for dating the age of the formation of a particular layer of volcanic sediment. e. They are based on the fact that radioactive isotopes decay at known rates.
The "system of nature" is an approach to classify all of animate and inanimate nature
a. True b. False Indicate whether the statement is true or false
The world's first civilization in Mesopotamia developed:
a. between 1,000 and 2,000 years ago b. between 4,500 and 6,000 years ago c. between 7,500 and 10,000 years ago d. between 10,000 and 12,500 years ago