Question is below?

Question

The finding of harmful levels of DDT in grebes (fish-eating birds) following years of trying to eliminate bothersome gnat population in a lakeshore town is an example of:

a. eutrophication

b. biological magnification

c.the biomass pyramid

d.chemical cycling

e. increasing resistance to pesticides

Answer 1

b.  Biological magnification is when environmental contaminants become increasingly concentrated as you move higher in the food chain because the animals higher up are eating a lot of those on lower levels, accumulating all of the contaminant contained in them.