Biology
Ozone hole refers to

increase in the thickness of ozone layer in troposphere
decrease in thickness of ozone layer in stratosphere
decrease in the ozone layer in troposphere
hole in ozone layer

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Biology
Which statement best describes Arteries?

They have thin walls and transport blood away from the heart
They have thin walls and transport blood toward the heart
They have thick walls and transport blood away from the heart
They have thick walls and transport blood toward the heart

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