Concerning desertification, which of the following is false?
A) It is a problem in the Sahel.
B) It is associated with desert margins.
C) It has happened in the United States.
D) Overgrazing is a direct cause.
E) Fortunately, it is a major problem only in Africa.
Answer: E
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An organism that has had its DNA modified in a laboratory rather than through cross-pollination or other forms of evolution is known as a(n)
A) GMO. B) DDT. C) HBO. D) GOP. E) CSA.
Large crystals found in a fine-grained groundmass can indicate a(n) ____
A)origin from a magma with an early intrusive phase followed by an extrusive phase B)origin from a magma with an early extrusive phase followed by an intrusive phase C)rock of mixed volcanic-plutonic origin D)intrusive slow cooling process E)origin from a magma with an early intrusive cooling phase followed by an extrusive cooling phase
An ecosystem ________
A) encompasses all the organisms and the physical and chemical environment within an area B) is a grouping of plants and animals that interacts with one another in a way that causes the grouping to die C) is a regional grouping of plants, animals and other biotic factors D) is the total population of a specific kind of plant, animal or microbe and all members of which do or potentially can interbreed and produce young E) is a collection of interacting species living in a specific area
Which of the following is not true of first generation stars?
A) They have violent, explosive deaths. B) They are composed primarily of hydrogen. C) They are massive. D) They are short-lived. E) They are very dense.