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The kidneys take of up more Ca2+ and release vitamin D. The bones release Ca2+. The intestines increase reabsorption of Ca2+.
Coal Mining is considered the most dangerous job in the United States. Mining also possibly releases harmful chemicals in the environment.
Energy is the ability to do work. The form of energy that living things need for these processes is chemical energy, and it comes from food. Autotrophs make their own food. Heterotrophs obtain food by eating other organisms. Organisms mainly use the molecules glucose and ATP for energy.
Explanation:i hope this is correct
Answer:
People drink water that has been contaminated by animal feces
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