Ahomozygous dominant brown mouse is crossed with a heterozygous brown mouse (tan is the recessive color). what are the genotypic and phenotypic ratios of the probable offspring?

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.