Multiple choice

Which of the following statements is correct?

  1. All animals require a medium for respiration.

  2. In all animals, oxygen is transported by blood.

  3. In all animals, oxygen is taken in from water or air through gills or lungs.

  4. All animals need oxygen for respiration.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

All living cells require a medium for gas exchange, which is typically a moist surface. Option B is false because some animals use diffusion directly; C is false because many animals use skin or tracheae; D is false because some organisms are anaerobic.

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