Pls help me answer this asap

Which of the following would be a body response when stepping outside without a coat on a snowy day? a. senaceous glands. secrete more senum b. more liquid is transported by the body to the skin fir insulation c. blood vessels in the skin narrow and contract d. blood vessels in the skin expand

Which component in a graph indicates an independent factor? a. y-axis b. x-axis c. scale

Why has two different alleles for the same trait?