How does a jelly fish avoid being eaten? How does it reproduce itself?

Question

How does a jelly fish avoid being eaten? How does it reproduce itself?

Answer 1

Most jellyfish pass through two distinct life history phases (body forms) during their life cycle. The first is the polypoid stage, when the jellyfish takes the form of either a sessile stalk which catches passing food, or a similar free-floating configuration. The polyp's mouth and tentacles face upwards, reminiscent of the hydroid stage of the somewhat closely related anthozoan polyps, also of the phylum Cnidaria. The polyp will then move around until it attaches itself to a suitable home.

In the second stage, the jellyfish is known as a medusa. Medusae have a radially symmetric, umbrella-shaped body called a bell. The medusa's tentacles are fringe-like protrusions from the border of the bell. (Medusa is also the word for jellyfish in Romanian, Hebrew, Croatian, Spanish, French, Italian, Hungarian, Russian and Bulgarian.)

Jellyfish are dioecious; that is, they are either male or female. In most cases, to reproduce, a male releases his sperm into the surrounding water. The sperm then swims into the mouth of the female, allowing the fertilization of the ova. However, moon jellies use a different process. The eggs become lodged in pits on the oral arms, which form a temporary brood chamber to accommodate fertilization.

After fertilization and initial growth, a larval form, called the planula, develops from the egg. The planula is a small larva covered with cilia. It settles onto a firm surface and develops into a polyp. The polyp is cup-shaped with tentacles surrounding a single o*****e, resembling a tiny sea anemone. After an interval of growth, the polyp begins reproducing asexually by budding and is called a segmenting polyp, or a scyphistome. New scyphistomae may be produced by budding or new, immature jellies called ephyra may be formed. Many jellyfish species are capable of producing new medusae by budding directly from the medusan stage.

Most jellyfish have a lifespan of two and a half months; few live longer than six months but one species can live as long as 30 years and another species, T. nutricula, is effectively immortal.

A the other person said: one spits out eggs, other sperm

And yes, tentacles protect them. Good Luck!

Answer 2

Jellyfish use their tentacles to protect themselves, and a jellyfish spits out eggs and another spits out sperm, and the sperm fertalize the eggs, then they float somewhere, and start to grow.