Answer:
idk lol the answer is A i did it
Explanatiion: By finidng ways to use less elctricty we use less energy and less coal causing eocnomic gain
Problem solving I believe
Permitting the exchange of nutrients and gases between the blood and tissue cells is the primary function of capillaries. Capillaries are the smallest blood vessels , they are only one cell thick, and they act as sites of the transfer of oxygen and other nutrients from the bloodstream to the body tissues. Additionally, they also collect carbon dioxide, waste materials and fluids for return to the veins.
You need more context to the question, however I think I have it figured out.
Independent variable- various colors of light
dependent variable- The growth rate from each color
