Which three factors limit descriptive and comparative investigations? A. The way you must write hypotheses
B. The number of observations you can make
C. The amount of time or money required
D. The features of objects that you cannot see
E. The number of variables you can have

Which sentences describe point source pollution? in this type of pollution, the source of the pollution is single and easily identifiable. when runoff water from the melting of snow mixes with debris, it creates pollution. the runoff water, mixed with pollutants, reaches large areas with disastrous effects. alternatively, when a wastewater treatment plant releases harmful chemicals into a stream, the chemicals pollute the stream water because they are not treated for safety.