Many Weeds Have Become Resistant to the Herbicides That Were

Many weeds have become resistant to the herbicides that were once used to control them.Which of the following statements best explains this observation?

A) The weeds have evolved to become different species.
B) The herbicides have evolved and are no longer effective against the weeds.
C) Continental drift has caused the evolution of weed resistance in the herbicides.
D) Natural selection has acted on the genetic variability in the weeds' genomes, enabling plants that have herbicide resistance to reproduce more successfully.

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