What physical trait is present on adult zebra sharks but absent in juveniles?
Answer
Five prominent longitudinal ridges running along its back and flanks
Adult zebra sharks exhibit several structural features that differentiate them from their juvenile counterparts. One specific anatomical distinction noted is the presence of five prominent longitudinal ridges that run along the shark's back and flanks. This specific ridge structure is explicitly stated as being absent in the juvenile form of the species. While other features like the long tail and sensory barbels are characteristic of the adult, the five longitudinal ridges are specifically highlighted as an acquired trait during development.
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