Sun, ..soil water, climate .. green plants.. herbivorous animals.. carnivorous animals.. decomposers
Cells, tree, digestive system, public transportation system, government systems, school systems, families, dog, forest, pond, prairie, communication systems, towns, insect, solar system, weather systems, bird, correctional system, squirrel, soil, etc.
Answer:
headaches, lethargy or feeling tired, cravings, muscle pain, nausea, bloating and even insomnia.
Explanation:
