If a match is tied after 90 minutes, the two teams will play 30 minutes of extra time, separated into two 15-minute periods. In both periods, stoppage time will be calculated and added on, just like it is during the first and second halves.
Class Osteichthyes Diagnostic characters: 1. Bony endoskeleton 2. dorsal nares 3. two sets of paired fins 4. swim bladder (most species) Infraclass Teleostei Diagnostic characteristics: 1. homocercal tail 2. cycloid or ctenoid scales Ctenoid scale from Perca flavescens Perca flavcescens, the yellow perch (Mitchell 1814)
Sharks belong to the class of boneless fish known as Chondrichthyes. The Chondrichthyes class is divided in two sub-classes Holocephali {Chimeras) and Elasmobranchii {Sharks and Rays}. Similar species of sharks are put into Families, and families with similar characteristics are placed in larger groups called Orders.