Question

multiple choice question
the energy that flows through most biological systems on earth ultimately comes from which source?
heat from the earths core
the sun
the ocean
earths daily rotations

Explanation:

Plants use sunlight in photosynthesis to produce energy - rich molecules. Other organisms in biological systems obtain energy by consuming plants or other consumers that have eaten plants. So the Sun is the ultimate energy source for most biological systems.

Answer:

B. The Sun