Astudent is investigating the effect of plants on indoor air quality and states, "if plants are added to an indoor environment, the air quality will improve." this statement is an example of ?

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

Plants consume most of their carbon from a. the soil b. the water c. the roots d. the air

Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins