Based on the cycle of photosynthesis and cellular respiration, one can say that the ultimate original source of energy for all living things on earth is

The speed of  sound:   sound travels  at different speeds depending on what it istraveling through. of the three mediums (gas, liquid, and solid)  sound waves travel the slowest through  gases, faster  through  liquids, and fastest  through  solids.

Only algae, oak trees, and bermuda grass produce atp by photosynthesis i am almost positive