… Jellyfish have no bones, brains or heart?

… their tentacles can measure up to 40 metres, the equivalent of six buses lined up? However, not all jellyfish have tentacles.

… the largest jellyfish is about two metres in diameter (the distance between the opposite edges of a circle), which is twice the average height of a four-year-old child? The smallest ones measure just two centimetres in diameter – that is, they are one hundred times smaller.

… a jellyfish can split into two full jellyfishes? They are able to do this when they become adults.

… some species manage to return to the initial phase of life during times of stress? In this phase, called the polyp, they have no tentacles.

… 98% of these animals’ bodies are made up of water?

… some jellyfish glow in the dark? This tactic serves to distract animals that try to feed on them.

Sources: Biologia Net, Ciclo Vico, Dúvida Animal column of the Joca website, Jornal de Biologia, and Planeta Biologia

Questions

1) Which of these statements is not true?
a) Jellyfish can divide into two.
b) Some jellyfish glow in the dark.
c) Jellyfish have no bones, mouth, or heart.
d) A jellyfish’s tentacle can measure up to 40 meters.

2) Have you ever seen a jellyfish? What was that experience like?

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