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Many visitors to the hills suffer from s...

Many visitors to the hills suffer from skin and allergy problems because

A

Percentage of oxygen is low at high altitudes

B

Partial pressure of oxygen is low at high altitudes

C

They exhibit physiological polycythemia

D

Conifer trees produce a large quantity of wind - borne pollen grains

Text Solution

Verified by Experts

The correct Answer is:
D
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