With industrialized food production, for every one unit of energy put on the table in the United States, how many units of nonrenewable fossil fuel energy are required to produce it?
A. 1
B. 2
C. 5
D. 10
E. 100
Answer: D
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A) almost solely plants. B) decaying plants and/or animals in the soil. C) almost solely animals. D) animals and plants in the sea only.
What was the first rail hub of the United States?
A) Atlanta, Georgia B) Boston, Massachusetts C) Chicago, Illinois D) Denver, Colorado E) Erie, Pennsylvania
Which of the following describes how a metal atom behaves in a bulk metallic object?
A) The metal ion shares its outermost electrons freely with its neighbors. B) The metal atoms have limited interaction with neighboring atoms. C) The metal atom shares its electrons in a very directional manner. D) The metal atom shares its electrons with only one other atom. E) none of the above
What causes a decrease in oxygen levels beyond the sunlit layer?
a. The respiration from marine animals and bacteria b. The by-products of photosynthesis c. There are fewer animals present d. Decreased saturation because of cooler water