The part numbered 12 is

Mandychid

5 years ago

It is an opercular plate. like it basically cover the operculum.

olusolajune

3 years ago

no diagram in the question

Erhunval

3 years ago

The diagram did not show

Joshuaolusoga

3 months ago

An opercular plate is part of an operculum( a lid-like structure ) in some organisms.
• fish (gills cover: part of the gill structure

bella287

1 year ago

no diagram

Son1

2 years ago

C is correct

Toclay

5 years ago

The operculum is found in the bony fish