Worldwide, the amount of forest land is,
A. decreasing is North America.
B. increasing in tropical Africa.
C. increasing in Europe.
D. decreasing in Central and South America.
Answer: D
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Two chemical structures are shown, one of a typical gasoline molecule and the other of a typical motor oil molecule. Which is which?
Base your reasoning not on memorization but rather upon what you know about molecular interactions and the various physical properties of gasoline and motor oil.
A. Structure A represents the gas molecule because there are more bonds to gain energy from, giving it a higher energy content than oil. B. Structure B represents crude oil which is processed to generate longer molecules of gasoline to prevent toxic vapors from harming consumers. C. Structure B represents the oil molecule. Because oil molecules are smaller, they can compact closer together, giving the appearance of a thicker solution than gasoline. D. Structure A represents motor oil, illustrating a molecule with greater induced dipole-induced dipole molecular interactions; thus, the molecules are strongly attracted to one another.
The area necessary to maintain all different patch types and populations of their associated species, given the typical patterns of disturbance, is defined as the ________
A) secondary growth B) old-growth area C) establishment stage D) minimum dynamic area E) primary growth
In areas prone to beach erosion, buildings are commonly elevated 4 m above the beach on _______________
Fill in the blank with correct word.
parts of bryophyte
swimming sperm vascular tissue pollen seeds flowers fruits