Biology
Medium
Question
At level above _____ , sound turns into harmful noise pollution?
A
80db
✓ Official correct answer
B
30db
C
100db
D
120db
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
80db
No member explanations yet for this option.
B
30db
No member explanations yet for this option.
C
100db
No member explanations yet for this option.
D
120db
No member explanations yet for this option.