The term biological magnification refers to the increased levels of a toxin seen in successive trophic levels in a food web. Which one of the following options correctly states the reason(s) for the increment of a toxin in the ecosystem?

The toxin is highly toxic to primary producers, relatively less toxic to primary consumers, and non-toxic to secondary consumers. Thus, a higher level of toxin is seen in species representing higher trophic levels.

The toxin cannot be degraded by microorganism and consequently persist in the environment for years.

The toxin to begin with was not toxic or less toxic, but became more toxic by metabolism in the primary producers.

Both (2) and (3)