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Blood is running out!

Biology Level 2

Anemia can be most likely caused by the failure of which of the following organs?

Lungs Liver Spleen Kidneys Heart

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Excel in math and science

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It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

Used and loved by over 6 million people

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including olympiad champions, researchers, and professionals.

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by Worranat Pakornrat

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