how do scientists use a branching tree A. to study the presence of homologous structures in organisms B. to show how groups of organisms might be related C. to study whoch organims have similar stages of development D. to show how groups of organisms become isolated

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?

An atom with 7 protons, 6 neutrons, and 7 electrons has an atomic mass of amu. (enter a whole number.) numerical answers expected! answer for blank 1:

Calculate the concentration of all species in a 0.165 m solution of h2co3.