pls help

Consider the following scenario: A drought hits the habitat of a semi-aquatic bird population. All ponds
dry up, and fish populations decline. There are two groups of birds in the population that differ in leg
length and diet. Long-legged birds eat insects. the drought has little effect on the insect populations.
What is the main selective pressure in this scenario?
(1 point)
Drought
Insect population
Leg length
Fish population

Drought