The side effects of heavy and constant grazing is that the

Body compensates low oxygen availability at high altitudes by

$I.$ increasing $RBC$

$II.$ decreasing binding affinity of haemoglobin

$III.$ increasing binding affinity of haemoglobin

$IV.$ increasing breathing rate

$V.$ decreasing breathing rate

Choose the correct option for given statement

Most living organisms cannot survive at temperature above $45\,^{\circ} \mathrm{C}$ . How are some microbes able to live in habitats with temperatures exceeding $100\,^{\circ} \mathrm{C} ?$

Distinguish between the following:

$(a)$ Hibernation and Aestivation

$(b)$ Ectotherms and Endotherms

$A$ kind of similarity found in polar regions and high altitudes is