3 changes that have been made for each (lighting, heating/cooling, transportation) that made them more efficient over time

When a gasoline engine burns gasoline, what type of chemical reaction is occurring?

What are the two functions of the respiratory system

Brainlest awardhow does smoking and arterial plaques increase the risk of hypertension? (2 points) select one: a. both increase blood volume. b. both decrease blood volume.c. both expand the diameter of the blood vessels. d. both constrict the diameter of the blood vessels.