The simplest atom contains one proton and one

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.

When the water vapor cools it condenses select a number that represents his process on the

Nonpoint source pollution is difficult to control because it