Acidic solutions have pH of less than 7. Neutral have pH of 7. Basic solutions have pH higher than 7.
U need to utilize mirrors to build the power of sunlight based vitality for a specific gadget.
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.
The answer is "open the mouth in search of a nipple when touched on the cheek," or answer C.
