Collagen is secreted by fibroblasts. Some type of collagen are also secreted by epithelial cells. There are different types of collagen in the body.
Collagen is the most abundant protein in the body and a key components of all connective tissues. It provides the infrastructure of the muscoskeletal system which are essential for mobility.
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Answer: An independent variable is exactly what it sounds like. It is a variable that stands alone and isn't changed by the other variables you are trying to measure.
Answer:
B
Explanation:
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