Respiratory Tree | MCQs

Explanation

Tube feet, respiratory tree, and papillae are all present in Holothuroidea, which are commonly known as sea cucumbers.

Holothuroidea is a class of echinoderms that includes various species of sea cucumbers.

Explanation

 The bronchioles are small branches of the bronchi, and they eventually end in tiny air sacs called alveoli where gas exchange occurs.