Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test Biology Ecology and Environment Environment
Which of the following statements is true about contamination?
1
Contamination is caused by the entry of germs from an animal bite
2
Contamination is caused by the entry of germs by an insect bite
3
Contamination is caused by the entry of germs into drinking water or edible foods.
4
More than one of the above
5
None of the above