Answer:
Coal. Coal is a chemical sedimentary rock made mostly of carbon. It forms from the remains of plants that lived in moist environments rich in trees, shrubs, water, and mud. In such swampy settings, the dead plant debris is quickly buried and thus escapes rotting away at the earth's surface.
Explanation:
D) gravel on the bottom of the aquarium. "Abiotic" means "non-living," so you would essentially pick the answer that does not include any organisms (the organisms here are plants, fish, and algae).
Answer:
green colour is most important
Blood cloth... it prevents the further flow of blood out of the body during a cut and prevents the inflow of other bacteria