Some
lampreys have 7 gill arches
tadpole, a frog's larva.
The gill arches support the gills.
Tilapia have four pairs of gills, totaling eight gill arches in their gill chamber. Each gill arch supports numerous gill filaments, which are responsible for gas exchange. This structure allows tilapia to efficiently extract oxygen from water as they breathe.
The gill rakers on fish keep food particles from moving out from in between the gill arches. For filter feeding fish and some suspension feeding fish, the gill rakers function is to trap the food.
Gill arches in fish provide structural support for the gills and contain blood vessels that aid in oxygen exchange. They also help regulate the flow of water over the gills to maximize oxygen uptake and remove carbon dioxide. Additionally, gill arches play a role in vocalization and feeding in some species of fish.
Respiratory system Agnathans are characterized by seven pairs of gill pouches. The bronchial arches supporting the gill pouches lie close to the body surface.
well, they do live underwater for the begining stages of life so... its kinda self explanitory.
They lose their tail, gills, gill pouch, and part of their intestines.
"Jaws are believed to have evolved from the first pair of gill arches of agnathans. The second pair of gill arches became support structures for the jaws." - Biology Laboratory Manual, Ninth Edition Darrel S. Vodopich and Randy MooreSo, sharks have fewer gill slits because the first two pairs became the jaw and the structural support for the jaw.
Gill rakers and gill filaments can be distinguished by their structure and function. Gill rakers are typically found on the anterior part of the gill arch; they are comb-like structures that help filter food particles from the water. In contrast, gill filaments are long, thin structures that extend from the gill arches and are responsible for gas exchange, containing numerous tiny lamellae where oxygen and carbon dioxide are exchanged. Observing their location and shape within the gill structure can help differentiate them.
Tadpole's Promise has 32 pages.