ASAP..pls need help what heppens when humans waste, biological waste and industrial waste is dumped into the water??

Iknow #2 is d. i just need to know why

Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth