Most of the world's active volcanoes are ____
A)in South America
B)randomly distributed
C)currently erupting
D)in well-defined zones
E)the result of hot spot volcanism
D
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Which of the following is true of adaptive immunity when an invader is encountered for the second time?
A) The first and second responses are both slow. B) The first response is faster than the second. C) The second response is faster than the first. D) There is no need for a second response.
An increase in seawater density can be caused by a ________ in temperature or a/an ________ in salinity
A) decrease; decrease B) decrease; increase C) increase; decrease D) increase; increase
The cattle egret is a large North American bird that commonly sits on the backs of grazing cattle and eats insects that pester the cattle. This is an example of ____________________
Fill in the blanks with correct word
If a neutral atom loses one electron, what is the electrical charge of the atom?
A. ?2 B. neutral C. +1 D. +2 E. ?1