Which type(s) of microscopes can produce three-dimensional images of cells? a. transmission electron microscopes c. both a and b b. scanning electron microscopes d. neither a nor b

Nitrogen-14 and nitrogen-15 are isotopes of the same element. how do these two isotopes differ? a. they have different numbers of nuclei. b. they have different numbers of protons. c. they have different numbers of neutrons. d. they have different numbers of electrons.