hair
cilium
scale
feather
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JUDDO HAIR IS FOR OSMOREGULATORY FUNCTION WHILE CILIUM IS FOR MOVEMENT.THE ANS. IS HAIR.

Chaii... So frustrated!... It aint CILIUM..at all...cilium is even d least evolved among d options...its hair..4 mammals

The most recently evolved structure in animals is subjective and can vary depending on the context and specific lineage. However, feathers are generally considered to be a relatively recent evolutionary development in the animal kingdom, particularly in the lineage of birds. Therefore, the correct answer would be: feather

The most recently evolved structure in animals among the options provided is D. feather. Feathers evolved relatively recently in the evolutionary history of animals, primarily among birds, making them a more recent development compared to hair, cilia, and scales.



