Replacement of calcium (Ca) in limestone by magnesium (Mg) generally results in dolostone. Indicate whether the statement is true or false
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How can the oxygen-isotope ratio in the calcium carbonate shell remains of organisms found in ocean sediment provide information about past sequences of glacier advances and retreats?
Storms along ________ are more severe than storms along ________
A) warm fronts; cold fronts because warm fronts move more quickly B) warm fronts; cold fronts because uplift is more rapid along warm fronts C) cold fronts; warm fronts because cold air holds more moisture than warm air D) cold fronts; warm fronts because uplift is more rapid along cold fronts
A maglev is/does all of the following EXCEPT
A) a magnetically elevated train. B) cruises on a cushion of air at high speeds on a detached right-of-way. C) state of the future in ground transportation systems. D) produces little or no air pollution. E) four times as efficient as automobiles.
Which of the following correctly describes the interactions between antigens, class I MHC molecules and T cells?
A) Antigens bound to class I MHC molecules and interact with helper T cells B) Antigens bound to class I MHC molecules and interact with killer T cells C) both a and b D) neither a nor b