It's purpose is to break down energy from carbohydrates and other organic molecules stored during photosynthesis
12. Cells
13. Tissue
14. Motor Neurons
15. Energy
16. Water
17. Microscope
In cells, the metabolic processes take place in its mitochondria, located conveniently within the cell, away from the nucleus. The other answer is wrong. Hope this helps!
They are in a mutually beneficial or symbiotic relationship.