Question

(i) What stops blood from flowing backwards through the heart.



(ii) Name the process used by single-celled organisms for taking in
food, exchange of gases or removal of wastes.​

Answer 1

Answer:

what all answer but nice question ..

Answer 2

(I) The aortic and pulmonic valves close, preventing backward blood flow into the heart. The mitral and tricuspid valves then open to allow forward blood flow within the heart to fill the ventricles again.

(ii) Diffusion is the process used by single-celled organisms for taking in food, exchange of gases or removal of wastes.

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Hope it will help you..