This question is very very urgent:- a. What is the reason for different types of silk?
b. Why are eggs laid by female silk moths warmed?
c. After how many days, caterpillars stop eating and start to spin cocoons?

Explanation:

i think b. is the warmer the weather, the quicker the Silkworm will complete its life-cycle,

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.  

answer; synapse;