Reaching The Age Of Adolescence

Biology
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If adolescents do not maintain cleanliness, they may catch ____________ infections.

A
Bacterial
B
Fungal
C
Viral
D
None of the above
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How sex of an offspring determined in humans?

A
Sex chromosome of mother
B
Size of ovum
C
Size of sperm
D
Sex chromosome of father
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Key factor of sex determination in humans is: 

A
Y chromosome
B
X chromosome
C
Autosomes
D
Both A and B
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