Question

give short answers of each question

Answer 1

i am answering the question of long answer type 2(a)

breathing through nose is healthier than breathing  through mouth because mouth do not contain ciliated epithelium so it does not trap mucus ,so it cannot trap dust particles and germ which may causes some kind of diseases.

 i am answering the question of long answer type 5(a)
ribs helps to protect lungs and heart.