The abiotic factor is the amount of oxygen. Abiotic means non-living, and all the other answer choices reference living things.
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Answer: Collagen is the most abundant protein in the body. Its fiber-like structure is used to make connective tissue. Like the name implies, this type of tissue connects other tissues and is a major component of bone, skin, muscles, tendons, and cartilage
Explanation:
Chloroplasts is where photosynthesis take place
