Question

please answer to my question ​

Answer 1

Answer:

1st one option B and

2nd one option also B

Explanation:

i hope it will help you

Answer 2

Answer:

b ) right atrium and right ventricle..... these valves prevent backward flow of deoxygenated blood.

b)protect the heart from shocks.....this fluid lubricates the heart and protect it from injuries

HOPE IT HELPS