Surface runoff from urban areas can contain high levels of pollutants. The pollutants in the surface runoff that flows into the ocean A creates food sources for native marine fish. B helps native marine fish adapt to freshwater. C poisons and kills off many native marine fish. D carries many native marine fish to lakes.

What are charcteristics of lithosphere?

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna