Do you think all organisms rely on the Sun in part for energy? Explain your reasoning.

Yes:

At the bottom of every food chain are producers. They make up the backbone of life on earth. Without organisms that take energy from the sun and convert it to usable energy, where would all the other organisms, like us, get our energy? While many times it is indirect, all organisms, in part, rely on the sun for energy and in turn, for life.