In bacteria,fungi,and lower plants,various kinds of thick-walled spores are formed which help them to survive unfavourable conditions. This phenomenon can be called ...........

The biosphere is composed of ......

What does $Allen's$ rule represent?

$A$ plant species shows several morphological variations in response to altitudinal gradient. When grown under similar conditions of growth,the morphological variations disappear and all the variants have common morphology. What are these variants called?

Small animals have a $......P.......$ surface area relative to their volume, so they lose body heat $.....Q.....$ when it is cold outside.

The taiga region is also known as