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Functions of seal in an engine include;Prevent oil or grease leaking from where it is neededPrevent entry of dirt, duct or grit into the sealed areaImproves engine breathing
Systems of a tractor engine are;Fuel systemElectrical systemcooling systemLubrication systemPower transmission systemIgnition system
Features of water action in arid areas include;WadisBajadas/BahadasInselbergsPlayasSalinasPedimentsPediplainsMesasButtesDry river valleys
Features of a clean milkman are;Free from contagious diseasesPhysically cleanWears white overall when milking and handling milkShort finger nailsCovered hair
Features of monopolistic competition include;There are many buyers and sellers which act independentlyNo barrier to entry or exit into the market. Anyone is free to join the industry at will and leave as he wishes.Products sold are similar but different in terms of branding and packaging.Buyers and sellers have wide knowledge about the market i.e price, quality and quantity.No single firm has control over the factors of production that can easily enable it enjoy monopoly