Which organism has a central brain? a fish b flatworm c sponge d hydra

Between 2014 and 2016, more than 25,000 children in flint, michigan, drank water that was contaminated with lead from lead pipes. during this time, the city claimed the water was safe to drink. which of these actions could the city have taken to ensure that the drinking water was free from lead?

What is happening when the water inside a kettle heats up and begins to boil

How to calculate the mass of copper