Which ecological factors are the most strong determinants of various biomes?

Most dominant direct factor which influences the growth of plants is

Write a short note on:
$(a)$ Adaptations of desert plants and animals
$(b)$ Adaptations of plants to water scarcity
$(c)$ Behavioural adaptations in animals
$(d)$ Importance of light to plants
$(e)$ Effect of temperature or water scarcity and the adaptations of animals.

Average temperature of thermal springs and deep sea hydrothermal vents exceeds (in $^{\circ} C$)

Which biological factor is responsible for poor vegetation in deserts?

Does light factor affect the distribution of organisms? Write a brief note giving suitable examples of either plants or animals.