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The ability of hair to expand and contract is its:

  1. elasticity

  2. porosity

  3. texture

  4. condition

The correct answer is: elasticity

Hair's ability to expand and contract refers to its elasticity. Elasticity is the characteristic of a material that allows it to return to its original shape after being stretched or compressed. This describes hair's ability to snap back into place after being pulled or styled, which is a result of its elastic properties. Porosity, texture, and condition are all incorrect options because they do not accurately describe this quality of hair. Porosity refers to how easily hair can absorb and retain moisture, while texture refers to the thickness and coarseness of individual hair strands. Condition, on the other hand, refers to the overall health and appearance of hair and does not specifically relate to its ability to expand and contract. Therefore, these options can be eliminated as they do not pertain to the question at hand.