Multiple choice

In insect's tracheal system, the transport of oxygen to the target tissue is done by

  1. fine branches of air tubes extending to almost every cell

  2. a liquid that fills the tracheal tube

  3. a specialized set of cells that produce myoglobin

  4. a specialized pigment
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A Correct answer
Explanation

In insects, the tracheal system consists of a network of tubes that deliver oxygen directly to tissues via fine branches called tracheoles, which reach almost every cell.

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