Question

Respiratory tree is found in :
(i) Holothuria
(ii) Planula
(ii) Obelia
(iv) All of the above​

Answer 1

It also sometimes includes the larynx. The lower respiratory tract is also called the respiratory tree or tracheobronchial tree, to describe the branching structure of airways supplying air to the lungs, and includes the trachea, bronchi and bronchioles.

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