An atom with 4 protons, 5 neutrons, and 4 electrons has an atomic mass of amu. (enter a whole number.) numerical answers expected! answer for blank 1:

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.