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' derinthescarletpescatarian: #/blood is imitation seawater/ is the part that’s confusing Picture this: you are a Thing That Lives In The Ocean. Some kind of small multicellular animal a long time ago, before proper circulatory systems existed. “Wow;” you think, metaphorically, “it sure is difficult to diffuse chemicals across my whole body. Kinda puts a hard limit on the size and distance of what specialised organs | can have. Good thing I have all this water around me that's the same salinity as my cells (they have to be that way so | don't explode or shrivel up) so | can diffuse and filter chemicals with that.” “Wait a minute;” you say a couple of generations later, because you're not actually a small animal but an evolutionary process personified and simplified to the point of dangerous inaccuracy for the purposes of a Tumblr post, “instead of losing all these important chemicals to the water around me, how about | put it in tubes? | can keep MY water separate from the rest of the world’s water! Anything | want to keep goes in my water! Anything | don’t, | dump back into the outside water! I'm a genius! An unthinking natural trial-and-error process that's a GENIUS!” “Wow,” you think a great many generations later, “being able to have such control over such high concentrations of important chemicals is S0 great.