Why does the cross jellyfish soar freely in the water column and does not sink to the bottom?

Why does the cross jellyfish soar freely in the water column and does not sink to the bottom? What adaptations to the mobility of the aquatic environment do living organisms have?

She has tentacles with which she slowly touches and due to this soars in the water column.
Adaptations – tentacles, fins, tails, streamlined body shape, low weight.



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