Biology
Which of the following is true about veins?

Veins have valves; arteries do not
Veins are more muscular than arteries
Veins have a smaller diameter lumen than arteries
Veins carry blood away from the heart, while arteries carry blood to the heart

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Biology
Osmosis is the flow of solution from higher concentration to a solution of lower concentration through a semi permeable membrane. What is incorrect in this statement?

The flow of solution is not possible through semi permeable membrane
Exact concentration of solution is not given
Character of semi permeable membrane is not given
All are incorrect

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