How are jellyfish born?

Jellyfish are weird, jelly-like animals with lots of tentacles but no brain or bones or heart or blood! Look at this compass jellyfish my nephews found when they were exploring the rockpools at the beach in Falmouth during the Summer holidays:

compass-jellyfish-falmouth

So, when I was asked a question about how jellyfish reproduce (make babies) and how they die, I just had to find out the answers…

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