Question

1. The blood group which can receive blood
from all the four blood groups is
(a) A
(b) AB
(c) B
(d) O
2. Which one is not correct about veins?
(a) Veins are thick-walled
(b) Veins have valves to maintain
unidirectional blood flow
(C) Veins are collecting vessels
(d) Blood in veins flows towards heart
plzzz answer it fast..
its urgent​

Answer 1

Answer:

2.veins are thick walled

Explanation:

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Answer 2

Answer:

1)O

2)Veins are thick walled.

Explanation:

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