Which of the following is likely to be researched by a toxicologist?
a. the effect of natural disasters on the environment
b. the effectiveness of current environmental law
c. the effect of species loss on the environment
d. the effect of pesticides on organisms in the environmen

As for this problem, the most probable answer and the most likely answer for this one would be D. the effect of pesticides on organisms in the environment.

A toxicologist would only study about chemicals and their effect on organisms in the environment. Pesticides are chemicals made to combat organisms that aren't wanted particular parts of the environment such as crops and rice field. These pesticides don't just affect those organisms that are targeted, but even the users and other organisms that may have come in contact with pesticides.

They became more resistant.