The most likely explanation for this phenomena is that this is a result of natural selection.
What actually happened?
When the insecticide was introduced, it killed all of the organisms that were vulnerable to it. However, there was a portion of the population that was immune. Since the immune individuals were the only ones that have survived and left offspring, after some generations in the population of this organism there were only their descendants that have the resistance to the insecticide.
Hihi!
The answer would be 2) Plenty of food! If you have plenty of food then the likely hood for more of the population to live would increase, the rest of the causes would cause decrease in the population!
I hope I helped!
-Jailbaitasmr
B? I don’t really remember when I learned that 3 weeks ago..
