Answer the all part

Dear student, a. Herbivores which are grass eating animals have a longer small intestine inorder to digest the cellulose present in the grass whereas meat is easier to digest. Hence carnivores have smaller small intestine than herbivores. B. Rings of cartilage are present in trachea to provide flexibility and support to trachea in addition to move and flex while breathing.Trachea prevents the collapsing of cartilage during absence of air.Mucus is secreted along with HCL in the stomach in order to prevent the lining from the stomach from the effect of strong acid like hydrochloric acid. Thanks and regards.