Most of the carbon in the rocks that form Earth's mantle and crust was stored there when Earth formed. The rest of Earth's carbon is stored in various reservoirs and exchanged in many ways. In a model of the carbon cycle, which process does NOT contribute directly to the storage of carbon within sediment?
A. the deposition of organic carbon from decaying organisms
B. the deposition of dissolved carbon dioxide from the atmosphere
C. the formation of carbon dioxide through metabolism of carbohydrates
D. the formation of fossil fuels from terrestrial organisms under high heat and pressure

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

i took a test for bio that had this question and these were the correct answers, not sure if this is any now lol

the nervous system and the muscular system work together.  

sweat reaches the surface of the skin and evaporates into the air.

muscles underneath the skin relax, causing hair on the skin to lay flat.