In the diagram above, the mantle is labeled
a. oceanic crust
b. continental crust
c. 3
d. 2
e. 1
Answer: c. 3
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Which trophic level usually contains more energy than any other trophic level in an ecosystem?
a. producers b. primary consumers c. secondary consumers d. tertiary consumers e. This answer has not been determined for most ecosystems.
A(n) ________ occurs when a warm, stagnant layer of air traps a cooler mass of air containing smog below it
Fill in the blank(s) with correct word
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Figure 35.9A
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The following question refers to the figure above of a human femur.
Spongy bone is indicated by the letter ____.
A. A B. B C. C D. D E. E
Some populations display continuous variation, which arises when _____.
A) epistatic interactions occur between the products of two or more genes B) environmental factors, such as temperature, vary seasonally C) multiple genes influence the inheritance of the same trait D) crossing over occurs during gamete formation