To produce 1 metric ton of coal, up to 30 metric tons of earth must first be removed or stripped. Some strip mines produce up to 50,000 metric tons of coal a day. How many metric tons of earth must be removed in order to mine 50,000 metric tons of coal?
A. 250,000,000 metric tons
B. 1,500,000 metric tons
C. 30,000 metric tons
D. 1,500 metric tons

Plzzz hurry im being timed ! humans, like other organisms, require energy for growth and repair. when cells create atp for energy, carbon dioxide is produced as a waste product. how does the body respond to this process in order to maintain homeostasis? a. the digestive and respiratory systems interact to move carbon dioxide to the lower intestine, where it is transformed into methane. b. the circulatory and digestive systems interact to move carbon dioxide to the stomach, where it to break down food. c. the nervous and urinary systems interact to move carbon dioxide to the kidneys, where it is absorbed into the bloodstream. d. the circulatory and respiratory systems interact to transport carbon dioxide to the lungs, where it is expelled from the body.

What evidence is there that convection occurs in earth’s troposphere?

4. how does a phospholipid behave in water? the phosphate head does not mix with water; the fatty acid tails do. the phosphate head and the fatty acid tails mix with water. the phosphate head and the fatty acid tails do not mix with water. the phosphate head mixes with water; the fatty acid tails do not.