The risk of contracting osteoporosis and other degenerative bone diseases is lessened by exer-
cise and an adequate intake of calcium.
Unlike administration of fluoride, administration of estrogen or calcitonin is known to cause undesirable side effects for many people.
The new bone mass that is added by the admin- istration of fluoride is more brittle and less elastic than normal bone tissue.
9. The closest distance from which an asteroid has been photographed using ground-based radar is 2.2 million miles, the distance from which the asteroid Toutatis was recently photographed. The closest photograph of an asteroid is of Gaspra, which was photographed from a distance of only 10,000 miles. Which of the following can be properly concluded from the statements above?
Toutatis is more likely to collide with the Earththan Gaspra is.
Toutatis, unlike Gaspra, has only recently been discovered.
Asteroids can be photographed only by using ground-based radar.
Ground-based radar photography cannot take photographs of objects much beyond 2.2 million miles from Earth.
The photograph of Gaspra was not taken using ground-based radar.
10. Which of the following most logically completes the argument below? Alone among living species, human beings experience adolescence, a period of accelerated physical growth prior to full maturity.Whether other hominid species, which are now all extinct and are known only through thefossil record, went through adolescence cannot be known, since
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