Energy flow in an ecosystem is NOT cyclic because energy is
A. destroyed as it is used.
B. evenly spread out over many organisms.
C. converted to heat, which is no longer useful.
D. increased as you go up the energy pyramid.
E. converted to many kinds of useful energy.
Answer: C
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Contrast
(a) is the amount that an object’s image is enlarged. (b) is the extent to which detail in an image is preserved during the magnifying process. (c) is the degree to which image details stand out against their background. (d) focuses light rays emanating from an object to produce an image.
In a molecule of methane, CH4, each hydrogen atom shares an orbital with the carbon atom. The total
number of shared electrons in CH4 is ____.
a. 4 b. 2 c. 1 d. 8 e. 5
Why did internal fertilization likely evolve?
A. To increase the chances of successful fertilization. B. As a response to copulation. C. Because there were no safe places to lay eggs. D. As an adaptation to life in a terrestrial environment.
At any given time, what percentage of the body's capillaries have blood flowing through them?
A) 5-10% B) 20-25% C) 40-50% D) 85-90%