Describe the general characteristics of class Agnatha.

Class Agnatha includes the most primitive and jawless fish that lack paired fins, scales, and bones. They are commonly known as lampreys and hagfishes, and they are considered the most ancient surviving vertebrates. Here are the general characteristics of Class Agnatha:

1. Jawless: Agnatha lacks jaws and paired appendages. They have a circular sucking mouth lined with teeth.

2. Cartilaginous skeleton: Agnatha has a cartilaginous skeleton without bones.

3. External gills: Agnatha ________ ________ _________ ______ __________ __________ _________ _________ ___ _____ _____ _____.
   _______ ____ ___ _______ _____.
   _____ ________ _________ _____ ______ _________ _______ ___ ___.
   _____ _______ ___ ______ _______ ____ ________ __________ ______.
   ___ __________ _______ ____ _________ ________ __________ ______ _________.
   ___ _____ _________ __________ _____ _________ _______.
   ___ _________ ____ __________ _________ ___ ________ _____ ______ ________ _________ __________.
   _____ _________ __________ _____ ________ ________ ____.
   ____ _______ _____ _____ __________.
   ________ ________ _________ _______ __________ _____ _______.
   _________ ______ ___ __________ __________ ________ ________ _____ _________.
   ____ ______ _______ ________ _____ ___ ______ _______.
   _____ _________ ______ ____ _____ ________ ______ __________ _____.
   ______ ________ ____ ________ _________ _____ ____ ___.
   _______ ____ _______ _____ ____ ___.
   ______ _____ _______ _____ _______ ______ ________ _________ __________ ____.
   __________ _________ ________ ______ _____ ___ __________ _______ _____.
   ___ __________ ___ _____ _____ ______ ______ ______ ____ _______.
   ________ ______ ____ _______ _______ ___ ___.
   ____ _____ __________ _________ _________ _____ _____ __________.
   _____ __________ _________ _____ ______ ___ _________.
   __________ _____ ______ ____ _____ _________ _____.
   ____ _______ __________ _______ __________ _______ ______ _________ ________ ____ ___ ______.
   _____ __________ _________ ___ ____ _____ __________.
   __________ _____ _________ _____ __________ ______ _______ _______ ____.
   ____ _________ ____ ____ ______.
   _______ ________ ___ _____ ____ _______ _________ ________ ______ ______ _____.
   ______ _________ ____.
   Get Full Answer on WhatsApp