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Question
Humus is a major factor in deciding the soil structure.
Options:
A .  True
B .  False
C .  If ozone hole appears in tropical and temperate regions, it could cause a series of health problems.
D .  Ozone hole occurence is a seasonal phenomenon.
Answer: Option A
:
A
Humus is a major factor in deciding the soil structure because it causes the soil to become more porous and allows water and air to penetrate deep underground.

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