which of the following statement is true?
A man has brought about numerous changes
B man has polutted his environment
A both a and b are false
B a is false and b is true
C both a and b are true
D a is true and b is false
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which of the following statement is true?
A man has brought about numerous changes
B man has polutted his environment
A both a and b are false
B a is false and b is true
C both a and b are true
D a is true and b is false
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