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YAD from Podar International School Chinchawad, Pune
Subject :NSO    Class : Class 7
Why are valves used a.) to prevent oxygen go in cells b.) to pump blood to body c.) to prevent back flow of blood d.) to let the blood flow downward

Ans 1:

YAD from Podar International School Chinchawad, Pune
Class : Class 7
May be c

Ans 2:

Anany Aadil from Aggarwal Public School, Faridabad
Class : Class 7
It's C Bro To prevent Backward Flow Of Blood

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