CATDOLL : CATDOLL: The living environment of kelp and seaweed. Why can they live in such an environment?

Kelp and laver live in seawater.

In order to adapt to the salinity of seawater and maintain osmotic pressure, the salt concentration of the cytosol in their cells is consistent with that of seawater, so they can survive in the sea. Once they are placed in fresh water, the cells in their bodies will penetrate into the cells (low concentration penetrates into the high concentration area) to balance the concentration inside and outside the cells, causing cell rupture and death of the organism; on the contrary, if land organisms are placed in the ocean or drink seawater directly, the cells of land organisms will penetrate into the outside of the cells (low concentration penetrates into the high concentration area) to balance the concentration inside and outside the cells, causing cell dehydration and death of the organism.

They live in water and can breathe in water