Isotopes are variants of a particular chemical element which differ in neutron number, although all isotopes of a given element have the same number of protons in each atom. The term isotope is formed from the Greek roots isos and topos, meaning "the same place"; thus, the meaning behind the name is that different isotopes of a single element occupy the same position on the periodic table.
I think it is A . eubacteria
Isn’t it I front of you because you are standing in front of the lamp
NAD is the electron carrier which is used in redox reactions in cellular respiration
