For effective functioning of a bird's quill feather, hooks fit on the ridge of the
Vane
rachis
barbules
barbs
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The correct answer is C. barbules.
For effective functioning of a bird’s quill feather, the hooks fit on the ridge of the barbules. The barbules are the small branches that extend from the barbs, which are the main branches of the feather. The hooks on the barbules help to hold the feather in place and provide structural support.

The hooks on the barbules help to hold the feather in place and provide structural support.
Sage🦨

OPTION C IS LEGIT

A quill feather has a central shaft called the rachis
Extending from the rachis are barbs, and each barb has tiny projections called barbules
The barbules have hooks that interlock with adjacent barbules, forming a smooth, continuous vane that allows the feather to function in flight and insulation.
Quick hack 🤭🤏Hooks to barbules to nterlock to smooth vane.
So: hooks are on the barbules....barbs was a misleading option 



