The term actinomorphy is generally used to describe radial symmetry in flowers.
常“辐对”描述辐花。
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Or a 5-limbed animal like a starfish—radial symmetry removes many of the limitations that would prevent odd numbers of limbs.
或者像海星那样动物——称消除了许多阻碍奇数限制。
But why five-part radial symmetry, specifically?
但为什么是称呢?
So how did the ancient ancestors of starfish go from having bilateral symmetry to having radial symmetry?
那么,海星远古祖先是如何从具有双侧称性演变成具有称性呢?
Except Ctenoimbricata didn't have radial symmetry.
除了梳状板动物没有称。
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