The lower respiratory tract is sometimes referred to as the tracheobronchial tree, this describes the branching structure of airways supplying air to the lungs, this includes the trachea, bronchi and bronchioles.
The animal’s anatomy is specifically evolved in and thus tied in with it physiology, thus affecting its interactions with the environment.
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It is cell wall and it provides support to the plant cell
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The two elements that make up the most common compound in the human body are oxygen (O) at 65% and carbon (C) at 18%. I hope this helped!! Have a great day!! :)