Multiple choice general knowledge science & technology

For which of the following air enters the respiratory system through a series of external openings called spiracles?

  1. Birds

  2. Fish

  3. Frog

  4. Insects
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Insects have a tracheal respiratory system where air enters through external openings called spiracles located along the sides of their body. These spiracles connect to a network of tracheal tubes that deliver oxygen directly to tissues. Birds use lungs, fish use gills, and frogs use a combination of lungs and skin.

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