Gases, nutrition, and waste are transported throughout the body of complex organisms through the circulatory system.
Oxygen, nutrients, and hormones are delivered to cells by the circulatory system, which also eliminates wastes like carbon dioxide. To keep everything moving in the right direction, these streets are one-way only.
The most sophisticated species ever investigated, gnomically speaking, is a minuscule, transparent water flea. The first crustacean whose genome has ever been sequenced is Daphnia pulex, and it turns out that it contains roughly 31,000 genes, which is 25% more than our own.
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