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1. Identify some of the essential elements of life. Give at least 5 example of elements.
Put it in the box below:
Elements
Sources
Functions


Sagot :

Answer:

ELEMENTS

  1. carbon
  2. oxygen
  3. hydrogen
  4. nitrogen
  5. calcium

SOURCES

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