Question

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What is the oldest thing on earth?

Are all jellyfish immortal?

What kills jellyfish?

What is the lifespan of a jellyfish?

Are jellyfish aware?​

Answer 1

Answer:

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Answer 2

Answer:

1. The zircon crystals from Australia's Jack Hills are believed to be the oldest thing ever discovered on Earth. Researchers have dated the crystals to about 4.375 billion years ago, just 165 million years after the Earth formed. The zircons provide insight into what the early conditions on Earth were like.
2. To date, there's only one species that has been called 'biologically immortal': the jellyfish Turritopsis dohrnii. These small, transparent animals hang out in oceans around the world and can turn back time by reverting to an earlier stage of their life cycle
3. Predation. Other species of jellyfish are among the most common and important jellyfish predators. Sea anemones may eat jellyfish that drift into their range. Other predators include tunas, sharks, swordfish, sea turtles and penguins.
4. Most jellyfish are short lived. Medusa or adult jellyfish typically live for a few months, depending on the species, although some species can live for 2-3 years in captivity. Polyps can live and reproduce asexually for several years, or even decades. One jellyfish species is almost immortal.
5. They don't have any type of 'centralized' nervous system. As far as anyone knows the two nerve nets and rhopalia do all the heavy lifting as far as 'thinking' goes.

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