The two groups representing the "jawless" fishes are:

A) Cephalochordata and Placoderms.
B) Chondrichthyes and Actinistia.
C) Myxini and Petromyzontida.
D) Dipnoi and Actinistia.
E) Placoderms and Petromyzontida.

Jawless Fishes

A group of fish that lack a true jaw, represented by modern lampreys and hagfishes, belonging to the superclass Agnatha.

Myxini

A class of jawless marine animals known as hagfishes, characterized by their slimy skin and primitive features.

Petromyzontida

An order of jawless fish, also known as lampreys, characterized by their eel-like appearance and parasitic or non-parasitic lifestyle.