Why does sexual reproduction introduce variety or variation ina species in 3 ways

How can fertilizer use be detrimental to the environment? a. it can enter waterways, causing them to accumulate an excess of nutrients. b. high levels of fertilizer in bodies of water can lead to excess algal growth. c. fertilizer can lead to oxygen depletion, and be harmful to organisms in waterways. d. all of the above select the best answer from the choices provided a b c d