Answer: organic.
The other three being proteins, nucleic acids (dna) and carbohydrate. They are all made up of the same elements. But your answer is organic. Hope this helps.
The answer is A, Shelter. Area A has a larger population than Area B which tells us that Area A has an advantage. Predators, Flooding, and Disease would lower the population. Shelter us the only answer that would increase the population. Good luck, I hope that helps!
The answer is <span>The respiratory system supplies the oxygen that the cardiovascular system transports to the different cells for the production of energy.
When air enters the lungs (part of the respiratory system), it passes all way to the alveoli, the smallest functional units of the lung. There, oxygen from the air enters the capillaries, the smallest blood vessels, next to the alveoli. Once in the blood stream, the cardiovascular system transports oxygen to different cells where it is used for the energy production.</span>
The answer, I’m pretty sure, is a because more energy is being used to burn which sets off more brightness :)