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Part of which organ is the endocardium?

Heart

Kidney

Livers

Stomach

The endocardium is the innermost layer of tissue that lines the chambers of the heart. Its cells are embryologically and biologically similar to the endothelial cells that line blood vessels. The endocardium also provides protection to the valves and heart chambers.

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How do baby birds get oxygen inside their eggs?

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How deep is the root system of a giant sequoia?

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20 meters (60 feet)

40 meters (130 feet)

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