Multiple choice

Gills are well supplied with _________ for exchange of gases.

  1. Blood vessels

  2. Mucus gland

  3. Air sacs

  4. None of the above

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

gills in fish help them to use oxygen dissolved in water. Gills are projectionsof the skin. You may wonder how gills help in breathing. Gills are well suppliedwith blood vessels for exchange of gases.