Biology, asked by thakurvandita90, 13 hours ago

Which of the following structure ensures that blood does not flow backwards , when atrium or ventricles contract? Pulmonary artery
Aorta
Septum
Valves

Answers

Answered by manreetkaur99

0

Explanation:

simplify ( 4 x square + 7 x -1 ) - ( X square + 8 x - 7 ) + ( X square + 10 )

Answered by JanviBoliwal

1

Answer:

please mark me in the brainless drop some thanks and followers

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