For number one, the shadows are longest at sunrise and sunset, and these are different from the ones cast at noon because they are longest and darkest. Hope this helped! I'll probably come back to help with the second one after I do more research :)
The answer here would be number 3, photosynthesis can e explained with the equation <span> carbon dioxide + water —> glucose + oxygen + water, this means that plants use light to convert carbon dioxide into carbohydrates or as you put it enery rich glucose molecules, this is the way plants make there food </span>
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