Two most important factors influencing the life of organisms are

In summer, when out side temperature is more than our body temperature, we sweat profusely. The resulting evaporative cooling, similar to what happens with a desert cooler in operation, brings down the body temperature. In winter when the temperature is much lower $37^o C$, we start to shiver a kind of exercise which produce heat and raises the body temperature. They are called.

$A$ : The soil of tropical rain forest has low base content.
$R$ : Such soil shows less percolation and leaching

Which of the following is most ecologically relevant factor?

Acclimatization is