A man treated his home with a pesticide that kills roaches. The first application of the pesticide killed 92% of the roaches. Two months later he applied the pesticide to his home again, but the second application killed only 65% of the roaches. What would best explain the decrease in the effectiveness of the pesticide?
Question 15 options:
The pesticide is effective only against mature roaches.
Once roaches learned how to fight the pesticide, they taught others.
The surviving roaches were naturally resistant to the pesticide, and that resistance was inherited by their offspring.
The pesticide caused some of the roaches' digestive systems to mutate and metabolize the pesticide.