How could an increase in the number of snails cause the caterpillar population to
increase?

The snail here is the primary consumer i.e. it feeds on plants and the caterpillar here is the secondary consumer i.e. it feeds on the snails. ... Hence, when there will be an increase in the number of snails , the caterpillar population will also increase.

Hope it helps ps have a great day :)

The answer is 25.1  wont let me give a short have a nice day?  

Lookingooglebsbzjjzjxjxj