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What does the term 'Cilia' refer to?

  1. Eyebrow hair

  2. Eyelash hair

  3. Beard hair

  4. Scalp hair

The correct answer is: Eyelash hair

Cilia refers to the small, hair-like structures that protrude from certain cells in various organisms. These structures are typically responsible for movement, such as moving cells or substances through the body. While all of the other options listed may also be classified as hair, they do not fit the specific definition of cilia and therefore are not correct answers. Cilia are not limited to hair found on the human body, as they can also be found in different types of organisms such as paramecia and algae.