Approximately how many years ago did our species, Homo sapiens, begin to migrate out of Africa and settle in Europe, Asia, and Australia?
A) 100 million years
B) 10,000 years
C) 1 million years
D) 100,000 years
E) 50,000 years
Answer: E
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The maximum sustainable yield, the maximum amount of each type of fish, crustaceans, and mollusks that can be caught without impairing future populations, probably lies between ________ metric tons
a. 15 and 20 million b. 100 and 135 million c. 20 and 30 million d. 100 and 150 billion
Farmers in the Midwestern United States routinely rotate between soybean and corn crops. Sometimes it is said that they do this because the soybeans introduce nitrogen into the soil
Although this is true, farmers also rotate their corn and soybean crops as a form of A) cultural control. B) natural enemies. C) genetic control. D) natural chemical control.
A tsunami in Japan would affect ____
a. ?all coastal areas of the Pacific b. ?areas within 1000 km of the epicenter c. ?areas in Asia only d. ?areas in Asia and the Pacific islands only e. ?areas in the northern hemisphere only
Judge the following sentence according to the criteria given below: The most worrisome toxic compounds in crude oil are polycyclic aromatic hydrocarbons such as napthalenes, benzene, toluene, and xylenes BECAUSE they can sicken humans, animals, and
plants even in small doses and can ultimately affect an organism's genetic materials. 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.