Chimaera

A)an organ for breathing underwater, consisting of membranes through which oxygen can pass
B)a deep sea fish with a skeleton of cartilage
C)made of cartilage, which is a strong, elastic connective tissue
D)a fin that is a fish's tail
E)rounded, like something swollen

B) a deep sea fish with a skeleton of cartilage.

Placoid

A)a flap covering the gills of a bony fish
B)an organ for breathing underwater, consisting of membranes through which oxygen can pass
C)scales that resemble a tooth, having a broad base and a narrow pointed top
D)a deep sea fish with a skeleton of cartilage
E)an organ along the side of a fish that can detect movement in the water

C) scales that resemble a tooth, having a broad base and a narrow pointed top.

Chimaera refers to various things depending on the context. It can be a term used in biology and anatomy or a name for mythical creatures. However, based on the options you provided, none of them seem to be a correct definition for Chimaera.

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