Why is the presence of E. coil bacteria being used to determine that water is contaminated harmful to drink please help what is this question asking me this is a science question

Answers are 1,2,4 its correct on edgenuity.

Those are different gas lawshere is a brief description of themcharles's law states that volume and temperature are directly proportional to each other as long as pressure is held constant.  boyle's law asserts that pressure and volume are inversely proportional to each other at fixed temperature.gay-lussac's law introduces a direct proportionality between temperature and pressure as long as it is at a constant volume.    source: