Answer:
C
Explanation:
It's pretty simple really, just find the <em>Benefit</em>. Pollution is definitely a harmful effect, disease is also not a benefit, and depletion of fish population is bad, so easing demand on commercial fisheries is the answer
Rod: night vision
Cone: day vision
A motor converts electrical energy into mechanical energy. Think of a car, it burns fuel (electrical energy) and turns it into tire spinning (mechanical energy)
the most important to the survival of the ecosystem is sunlight
