Which example is a biotic factor of an aquarium environment? A. number of underwater plants

B. amount of oxygen in the water

C. water temperature

D. amount of sand in the aquarium

(No websites or links just a answer)

Why was the sample heated in step 5? describe the chemical principles involved in the reasoning behind this step?

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Waianapanapa beach in hawaii is a black-sand beach that was formed by waves crashing against volcanic rock. the sand can be very hot on sunny days. which statement best explains why? o a. the black sand has no heat capacity. b. the black sand absorbs no radiation. o c. the black sand is immune to insolation. d. the black sand has a low albedo.