It begins as a baby jellyfish. They are swept up into massive groups with other microscopic sea life and called plankton.
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The lions mane jellyfishs' status has not been listed by the IUCN
Well, I'm guessing no. They just kinda float around, no need for senses.
Large types of jellyfish's can reach 8 feet diameter, with tentacles reaching 150 ft long.
A rose can begin it's life in a few different ways. It can begin it's life as a seed or as a rose branch.
in water
Immediately, now that I have enriched your life by answering your question.
puberty
As the seed that you eat
an egg
yes there is aliens are the only ones who can begin life there.
Stars begin their lives as clouds of gas and space dust.