Question

veins are thin walled and have valves. jusfify​

Answer 1

Answer:

Veins have thin walls because the blood is no longer under pressure

They have valves as the pressure is slow.. There are chances for the back flow of blood... Valves ensure that the blood doesn't flow backwards

Answer 2

Explanation:

cuz blood comes in low pressure as compared to arteries so they are thin walled and they have valves to prevent the backflow of blood.

Hope it helps!!

Have a great day!!