Higher concentration of CO cause:

A ) fatigue

B ) headache

C ) breathing difficulties

D ) all of the above

Related Questions
  1. The pH of normal rain water is:
  2. Ozone layer is found in:
  3. The ozone decomposition in upper stratosphere is due to absorption of:
  4. Ozone layer is found in:
  5. Which substances are involved in ozone depletion?
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