Since chloroplast use energy to make food for plant cells (Photosynthesis) I could compare it to lunch money, and how you have to keep refilling up, and up, just to use it again for food, for yourself.
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Oxygen will diffuse from an area of higher concentration (outside the cell) to an area of lower concentration (inside the cell). </span>
The raw materials of H2O and CO2 are located there
To make one glucose, the calvin cycle would need to turn 6 times.
I hope thid helps (:
