1. Since 1970, annual worker fatalities on the job have decreased in America by about
75 percent
63 percent
half
one-third

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Are there options for this?

Is there any opitions? if you have the periodic table, the noble gases are 8a family, the halogen are the 7a family, and the nonmetal are  carbon, nitrogen, phosphorus, oxygen, sulfur, selenium, fluorine, chlorine, bromine, iodine and astatine.

The answer is that they are composed mostly of liquid water.