Question

Give reasons. a. Divers carry oxygen for artificial respiration. b. Lungs are divided into very small sac like structures. c. The walls of trachea not collapse when there is less air in it. d. Lungs always contain a residual volume of air.

Answer 1

because divers can't take oxygen inside the sea

Answer 2

Answer:

A) Divers who dive into the deep sea, often face the problem of oxygen shortage, as the "concentration of oxygen decreases" with an increase in the depth of the sea. ... This is why the divers have to carry cylinders of oxygen for artificial respiration under the sea.