Answer:
The population of pink katydids will decrease.
The population of green katydids will increase.
Step-by-step explanation:
Natural selection is the process in which the individuals having the traits that help them survive better in a given environment are selected over those that do not and these naturally selected individuals tend to produce more offspring.
In the given situation, the garden has trees and shrubs which will allow the green katydids to camouflage in the surroundings and escape the predator whereas the pink katydids fail to do so and hence, are at a disadvantage.
Since the pink katydids are at a disadvantage this trait will not be favored by natural selection and thus, with time the population of pink katydids will decrease and green katydid will increase.