Question

1. no matter what food you eat, you can always trace the source of energy back to..

a. the sun and photosynthesis.
b. fertilizer.
c. the heat from the center of the earth.
d. oxygen and carbon dioxide.

Explanation:

Plants use photosynthesis to convert solar energy into chemical energy. Animals eat plants or other animals that have eaten plants. So, the energy in food ultimately comes from the sun and photosynthesis. Fertilizer provides nutrients but not energy. The heat from the center of the earth is not related to food energy. Oxygen and carbon dioxide are involved in respiration and photosynthesis processes but are not the source of energy in food.

Answer:

a. the sun and photosynthesis.