Mark the incorrect statement.

Which two of the following changes $(i-iv)$ usually tend to occur in plain dwellers when they move to high altitudes ($3,500 \ m$ or more)?
$(i)$ Increase in red blood cell size
$(ii)$ Increase in red blood cell production
$(iii)$ Increased breathing rate
$(iv)$ Increase in thrombocyte count
Changes occurring are

Which of the following is functional for protection against the environmental abiotic factor of temperature or for thermoregulation of the living body during winter or summer?

People who have migrated from the plains to an area near Rohtang Pass six months ago will exhibit which of the following characteristics?

In high-altitude regions,the $R.B.C.$ count in humans will . . . . . . .

In humans, respiration occurs in the following steps. Arrange these steps in the correct order.
$A$. Diffusion of $O_2$ and $CO_2$ between blood and tissues
$B$. Diffusion of $O_2$ and $CO_2$ across alveolar membrane
$C$. Pulmonary ventilation by which atmospheric air is drawn in and $CO_2$ rich alveolar air is released out
$D$. Cellular respiration
$E$. Transport of gases by the blood