Examples of surface tension:
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Walking on water: Small insects such as the water strider can walk on water because their weight is not enough to penetrate the surface.
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Floating a needle: A carefully placed small needle can be made to float on the surface of water even though it is several times as dense as water.
Alveoli are found in lungs and exchamge O2 and Co2 !!
so answer is last one !!
Valves ensure blood flows toward your heart. Vein valves work to bring the blood that flowed down via arteries back up to your heart.
Answer:
minnows which is in kingdom animalia
