The pharyngeal arches are the structures which are precursors of embryonic development in the vertebrates. In the fishes, gill arches or branchial arches mimicking the phyrangeal arches . Among the option given, the barb fish is the relevant option for the first blank.
This type of tail development is the characteristic property of the chordates. Among the options given, the newts is the relevant one as these are chordates.
If you want to know how it looks outside of your body then that's when your fingers are wrinkled like if you soak your hands in water or take a long shower or bath that could be when water is entering your cells. Hope this helps!
