What 2 biomes do not have trees and why do these biomes not have tall trees

The rate that would change would be the  searching efficiency/attack rate. there are only two other rates in this model: the  growth rate of prey, and the  predator or consumer mortality rate.the  searching efficiency/attack rate is what indicates how effectively can a predator capture its prey whether in the searching process or actual capturing/attacking process. 

1-taiga 2-desert 3-desert 4-taiga

This dessert was once a barren place for glaciers therefore supporting her scientific find