What does it mean to describe a scientist as skeptical? why is skepticism considered a valuable quality in a scientist?

Of the major religions today, which two are monotheistic?

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Acivilization exists for several hundred yeaars, developing its own language. such a civilization probably has been: a. farming corn b. suffering from a lack of contact with the outside world. c. isolated by mountains or some other physical barriers. d. starving from lack of trade.