Agnatha, which includes jawless fish like lampreys and hagfish, can have significant environmental impacts, particularly in freshwater ecosystems. For example, invasive species such as the sea lamprey have caused declines in native fish populations, disrupting local biodiversity and altering food webs. Additionally, hagfish contribute to nutrient cycling through their scavenging behavior, which can influence the health of marine ecosystems. Overall, the ecological roles of Agnatha highlight their importance in maintaining the balance of aquatic environments.
Externally
environmental factors affecting marketing activities
skin
without jaws
Heat
Temperature and moisture.
Agnatha, also known as jawless fish, lack jaws and scales. They have a cartilaginous skeleton, a round mouth, and a single nostril on their head. Agnatha are also known for their ability to produce slime as a defense mechanism.
by the gill slits
with gills; they're fish!
Class Agnatha
jawless fish. not very common today, but they were in the past.
no they have large bonelikes structures called the stonnes.