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Are there any animals that can return to their youth (青年時期)? There is one in the animal kingdom. It is the animal c1. the immortal jellyfish ( 永 生 水 母 ). Do you know a2. about it?

These small animals are just 4 to 5 millimeters ( 毫 米 ) l3.. Their digestive system ( 消 化 系 統(tǒng) ) l4. like a light. That’s why they’re also called Turritopsis nutricula ( 燈塔水母 ). Scientists f 5.found them in the Mediterranean Sea in 1883, according to National Geographic. When scientists discovered ( 發(fā) 現(xiàn) ) this, they were very s6. and they didn’t know much about it.

When these sea animals get hurt in d7.situations, they can change their cells(細(xì)胞) back to their earliest form—in other words, back to youth. The jellyfish’s cells can change into d8.kinds of cells. Muscle cells can become sperm (精子) or eggs, or nerve cells can change into muscle cells. T9., they grow again. Scientists are still wondering h10.this happens. Isn’t that amazing?

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