Where does the energy in almost all food ultimately come from?

• A. The Moon
• B. Ocean tides
• C. The Earth's core
• D. The Sun

Answer: (D)

Verified step by step guidance

1. Begin by considering the process of photosynthesis, which is the primary method by which energy enters the food chain.
2. Understand that photosynthesis is the process by which green plants, algae, and some bacteria convert light energy, usually from the Sun, into chemical energy stored in glucose.
3. Recognize that the energy stored in glucose is then used by plants for growth and reproduction, and it is passed on to herbivores and subsequently to carnivores through the food chain.
4. Consider the role of the Sun as the ultimate source of energy for photosynthesis, as it provides the light energy necessary for this process.
5. Conclude that the energy in almost all food ultimately comes from the Sun, as it is the initial source of energy that drives the entire food chain.