MCQ
Respiration is an ..........
- AEndergonic process
- ✓Exergonic process
- C$A$ and $B$ both
- DNone of the above
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($i$) It is made of a single thin layer of flattened cells with irregular boundaries.
($ii$) They are found in the walls of blood vessels and air sacs of lungs.
($iii$) They are involved in functions like forming a diffusion boundary. Which of the following characteristics of tissue is being described by the above statements?
$R$ : All vertebrates have hepatic portal system.