In the Section "Investigating Life:E

In the section "Investigating Life:E. T. and the Origin of Life," how are ¹³C and ¹⁵N different from the more abundant isotopes¹²C and ¹⁴N?

A) ¹³C and ¹⁵N each have one more neutron more than ¹²C and ¹⁴N.
B) ¹³C and ¹⁵N each have one more proton than ¹²C and ¹⁴N.
C) ¹³C and ¹⁵N each have one less neutron than ¹²C and ¹⁴N.
D) ¹³C and ¹⁵N each have one less proton than ¹²C and ¹⁴N.
E) ¹³C and ¹⁵N each have one less electron than ¹²C and ¹⁴N.