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

In the mountains, there is a lot of moisture and water and still the plants are xerophytes, because

Why do all the fresh water organisms have contractile vacuoles whereas majority of marine organisms lack them ?

Species that can tolerate narrow range of temperature are called $.............$ .

Give differences : Ectotherms and Endotherms

The organisms found in boiling thermal springs are