Sagot :
Answer:
ELEMENTS
- carbon
- oxygen
- hydrogen
- nitrogen
- calcium
SOURCES
- carbon dioxide emission come primarily from energ production, including burninh coal, oil, or natural gas.
- oxygen is liberated as a by-product of photosynthetic chemical reactions.
- wash your hand after you use the restroom.
- atmospheric precipitation, geological sources, agricultural land, livestock and poultry operations and urban waste.
- milk, cheese and other dairy foods. green leafy vegetables -- such as curly kale, okra and spinach. and ect.