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.
During phototropism, the plant hormone auxin<span> controls cell elongation.</span>
Answer:
D, but if feel sorry my second guess will be B
