Easy
which of the following traits is totally determined by genes?
social skills
color of hair
intelligence
ability to sing

B. Color of hair

Height, hair color, and eye color,  are traits passed on by genes. The correct option is B. Genes are found inside the chromosomes which are enclosed in DNA molecules therefor, making B the correct answer. Genes carry all the information that are responsible for the traits and character found in living organisms. Genes are typically pass from the parents to the offsprings.

(hope this helps)

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.