Which statement best explains how the cardiovascular system the body maintain a steady temperature in cold weather? a. the heart muscle contracts, pumping more blood to the extremities. b. the blood vessels in the skin constrict, reducing the rate of blood flow. c. the heart rate rises, increasing the amount of carbon dioxide in the body. d. the blood pressure drops, causing the heart and breathing rates to increase.

Refer to the family pedigree shown here. in generation i, one parent is affected by the gene mutation and one parent isn't. in generation ii, all three children are affected by the gene mutation. what can you conclude about this gene mutation? a. all children born in future generations will be affected by this disorder. b. this gene mutation is a dominant disorder. c. this gene mutation is a recessive disorder. d. the generation i mother is a carrier of this gene mutation.