13.
Which is not a product of photosynthesis?

water
oxygen
glucose
nitrogen

Nitrogen

Explanation:

Photosynthesis is a process used by autotrophs and producers, like plants, algae, and some bacteria. In this process, water, carbon dioxide and light energy from the sun are turned into glucose and oxygen. The glucose becomes food for the organism, and the oxygen becomes the waste product.

There is no nitrogen involved in photosynthesis. It is not created, and therefore is not a product. The best answer choice is nitrogen

b - the respond is innate and varies over time.

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