According to conventional thinking, simple animals, including sponges, jellyfish and corals, evolved step-by-step in a linear fashion into those with more complex bodies, such as mammals.
按照传统的见解，包括海绵、水母和珊瑚在内的简单动物按部就班发生演变，以线性方式形成像哺乳动物一样的更加复杂的生物体。
Jellyfish are part of the Cnidaria group, along with anemones and corals - about 5 per cent of the total.
水母以及海葵和珊瑚是刺胞动物的组成部分——约占总数的5%。
The animals that can possibly achieve immortality under ideal conditions, such as sea squirts, certain corals, Hydra, and Turritopsis nutricula (the immortal jellyfish), often activate telomerase.
有些动物很可能可以在理想的环境下达到长生不老，比如海鞘、特定种类的珊瑚、九头蛇、灯塔水母（不死的海蜇）。
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