When carbon is burned in ar it reacts with oxygen to form carbon dioxide. When 21.6g of carbon were burned in the presence of 72.8 g, 15.2 g of oxygen remained untraced. What mass of carbon dioxide was produced?

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.

they all get energy from eating other animals, dead animals to be more precise.

hienas tends to steal pray from other animals. crows and vultures tend to eat dead animals and leftovers.

hope it ,

bioteacher101