chemical contaminations means the contamination of environment by chemical substances like chemical released by industried in water, buring of chemicals in air tjat cause air pollution etc... hope it helsp u
Answer:
1a Bacteria/ Parasites
2a Alcohol Intake
Explanation:
1a Most Ulcers are caused by Bacteria or Helicobacter pylori
2a Alcohol Intake can raise the probability of developing a ulcer
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