Which of the following statements best explains why the energy pyramid is narrowest at the top? A The organisms at the top of the pyramid have the largest population sizes
B The organisms at the top of the pyramid receive only a small fraction of the energy that originally enters the system.
The organisms at the top of the pyramid are the most efficient feeders.
D The organisms at the top of the pyramid need only a small amount of energy for their metabolism.

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.

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the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.