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What does the term "porous" refer to?

  1. Has no pores or openings

  2. Made of a material that has openings

  3. Microscopic germ in water

  4. Structure of skin tissue

The correct answer is: Has no pores or openings

The correct answer is "Has no pores or openings" because the term "porous" refers to something that has small openings or holes that allow liquid or air to pass through. In the context of esthetics, porous materials can absorb substances and are common in skincare products for specific cosmetic purposes. The other options are incorrect because they do not accurately define the term "porous": - Option B is incorrect as it describes a material that has openings, which actually aligns with the definition of porous. - Option C is incorrect as it refers to a microscopic germ in water, which is unrelated to the concept of porous. - Option D is incorrect as it mentions the structure of skin tissue, which is not the definition of porous.