The document outlines the scientific method and key concepts in environmental science. It discusses how scientists form hypotheses to explain phenomena, design experiments to test hypotheses, and use results to support or refute hypotheses. The example provided tests hypotheses for what may be causing deformities in amphibians. Experiments showed both parasites and chemical contaminants can increase deformities, and their interaction has an even stronger effect. While no single factor explains all cases, research continues to better understand this complex environmental issue. Science has limitations but the scientific method is the best approach for building understanding.