Iwant to be a teacher some day and i know this humans have a nose to breath , but what do fishes use to breath without a nose? *i will upvote*

The open systems interconnection (osi) reference model: defines standards for many aspects of computing and communications within a network. is a generic description for how computers use multiple layers of protocol rules to communicate across a network. defines standards for wireless local area network (wlan) communication protocols. details the advantages and disadvantages of various basic network cabling options.