Which causes genetic variations and can result in different alleles? predation rate
random mutations
competition
environmental changes

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

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?

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?