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How has the scientific community addressed the safety of chemicals? a. chemicals are repeatedly tested, even those that have existed for a long time. b. existing chemicals are tested if they have never been tested before. c. chemicals are tested if they are suspected to have caused a problem. d. only new chemicals are tested.

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?