You and your younger sibling are at a state park. You come across a doe (a female deer) in a grassy clearing. Your sibling asked, "How does the deer survive on just grass?" You begin to explain to your younger sibling how all livings obtain and use energy. It
proves to be a difficult task, so, you decide to answer the few questions she has instead of lecturing her any longer. The
following question is one she is asking:
Where does all the energy on Earth used by living things originate from?
The Moon
The Sun
The Earth's Core
Mars