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  4. In animals, specialized cells for osmoregulation and excretion was first seen in

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Q. In animals, specialized cells for osmoregulation and excretion was first seen in

NTA AbhyasNTA Abhyas 2022

Solution:

In Platyhelminthes, specialized cells called flame cells help in osmoregulation and excretion. Platyhelminthes is the first phylum of organisms that have developed the organ systems to carry out various metabolic activities.