As a result of low brain-derived neurotrophic factor (BDNF), most people with depression exhibit neuronal loss, learning disabilities, and reduced production of new hippocampal neurons.
Brain-derived neurotrophic factor (BDNF) manages glucose and energy metabolism and controls exhaustion of β cells. Reduced levels of BDNF are associated with neurodegenerative disorders with neuronal loss, such as Alzheimer's disease, Parkinson's disease, and Huntington's disease.
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Acid Rain is the problem threatening many of Europe's (most specifically Germany's) forests, lakes, and rivers. Acid rain travels via the wind and the acid pollutants can travel through this said wind to multiple countries. It was a large problem in the 1970's and 80's.
The answer would be C, "The earth is heated by terrestrial radiation."
Terrestrial radiation is a factor in what heats up the earth and it's a major factor in the study of global warming.