collagen fibres are ………….while yellow fibres are ………………..

Explanation

To answer the question regarding collagen and yellow fibers, we can break down the information into clear steps:

### Step-by-Step Solution:

1. **Identify the Composition of Collagen Fibers**:
- Collagen fibers are primarily made up of collagen protein.
- They are known for their strength and structural support in various tissues.

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