A fish has no heart, brain or bones

A jellyfish is an invertebrate made up mostly of water, it has no heart, brain or bones. It is made up of 95-97% water, 3% protein and 1% minerals.

For the past few days I have been thinking a lot about jellyfish.
These jelly "fish" have NO blood, NO brain, NO heart!!!
Now, think about this for a second..... they do not have any of these vital organs for us humans, yet they have been around 600 million years! They do not have a brain.... therefore they don't have memories, they don't think, they don't compete, they don't complain, they don't have a sense of "I" like humans do.
They don't even have lungs or nose! they get their oxygen through diffusion.

Jellyfish can taste, know the difference between light and darkness, keep themselves balanced and sense up and down.
Its funny how us humans can barely do that. We have to try very hard to keep our lives balanced and know right from wrong...

They live in the present, don't really care about the past, and don't worry about the future. Yet, they are good predators, and can be very harmful to humans. They just eat, sleep, reproduce, die.