Opercula are absent in cartilaginous and jawless fishes and represent an evolutionary advancement seen in bony fish. how do opercula allow a bony fish to pass water over its gills while the fish remains statrionary? why would this be viewed as an adaptation?

the operculum is a movable flap covering each gill that can pump water over the gills

question: which statement best describes the different properties of metals?

answer: they are shiny and bend without breaking.

since metals have certain characteristics properties, they include the following: they are ductile, malleable, shiny, hard, lustrous, flexible and they are good conductor of heat and electricity. so therefore, metals are not dull and they are not non-flexible as listed. instead, they are shiny and flexible.

hope this , have a good day. c;