Hi, I am very curious about jellyfish.
Yes they are considered animals but they lack a brain, they have no organs, no blood…
But still they manage to stay alive and survive.
Like… how?
In: Biology
They have only what is required for survival and reproduction.
Brains, nervous systems, and organs are just another way to achieve the same goal, but not a requirement to do so. Bacteria live and thrive while being a single cell. Viruses (viri?) manage it with even less.
Nature *usually* rewards biologies that achieve those goals with the minimum energy needed. Jelly fish are very low energy.
Survival of the fittest/evolution isn’t about making the “best”, it’s about getting to “just good enough”. Rarely does a trait with excessive energy consumption result in a benefit, the human brain being a good example.
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