The 1, 000 large asteroids that cross the Earths path pose only an extremely slight risk of colliding with the Earth.
There is currently no acceptable use to which nuclear weapons can be put, aside from pro- tecting the Earth from asteroids.
4.It has long been thought that high levels of the hor- mone testosterone contribute to the onset of heart disease in men.However, this view cannot be correct, since men who have heart disease typically show significantly lower levels of testosterone than do men who have not had heart disease. The argument above assumes which of the following?
Many men who have never had heart disease have unusually low levels of testosterone.
Having heart disease does not significantly lower the level of testosterone in men.
Levels of hormones other than testosterone significantly affect the likelihood that a man will develop heart disease.
Heart disease and lowered testosterone levels in men are the effects of a single common cause.
High levels of testosterone have never been thought to contribute to a serious disease other than heart disease.
5.People who engage in scuba diving are healthier, on average, than people who do not engage in this activity.
Therefore, scuba diving tends to promote improved health. The argument is most vulnerable to criticism on the grounds that it
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