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What gas is in the bladders of bladder wrack?

bladder bladders Gas
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What gas is in the bladders of bladder wrack?

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Fucus vesiculosus (bladder wrack) and Ascophylum nodosum (egg wrack) are seaweeds that use gas-filled bladders to keep their fronds close to the water’s surface where the light is strongest. The gas contains the by-products of respiration and photosynthesis (O2, CO2 and CO), but the exact proportions vary because the bladders are in equilibrium with the surrounding air and water.

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