Primary Consumers
What will be an ideal response?
An organism that consumes producers and feeds at the second trophic level.
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Commercial agricultural systems in the core are especially efficient in terms of food production per unit of
A) area. B) labor. C) fuel energy. D) water. E) both area and labor.
Energy
A) occurs at only one scale. B) occurs at more than one scale. C) occurs only at scales that are very small. D) occurs only at scales that are very large.
What are the three layers of the earth based on composition?
What will be an ideal response?
Which of the following is correct regarding Alfred Wegener's hypothesis of continental drift?
A) He posited that 220 million years ago all the continents were joined together to form the supercontinent Pangaea. B) It was immediately adopted because of his geological background. C) Though it was later shown to be quackery, it nonetheless spurred innovations in scientific research. D) It was based largely on conjecture with little basis in observable evidence. E) Although he provided a mechanism for continental drift, he could not find evidence of it.