Biology
Which process requires cellular energy?

Active transport
Both A & B
None of these
Passive transport

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Biology
Ozone hole refers to

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

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Biology
Which statement best describes Arteries?

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

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