Asap 50 ! (only answer if you know for sure, and ty) the atomic number of an atom is the number of a. protons b. neutrons c. electrons and neutrons combined d. protons and neutrons combined an ion is an atom a. that has the same number of protons and electrons. b. that has an unequal number of protons and electrons. c. that has an unequal number of protons and neutrons. d. that has the same number of protons and neutrons. which of the following is true regarding photosynthesis and respiration? a. all cells can undergo both photosynthesis and respiration. b. photosynthesis occurs in the chloroplasts; respiration occurs in the mitochondria. c. photosynthesis breaks down glucose; respiration makes glucose. d. photosynthesis occurs in the mitochondria; respiration occurs in the chloroplasts.