$1)$ Cars and trucks are in the stage of the product life cycle, with most advertising focused on attracting customers from competitors. maturity growth introduction extinction decline$2)$ In the stage of the product life cycle, companies generally lose money because of high development and production costs and low sales. growth extinction maturity decline introduction$3)$ During which stage of the product life cycle do sales and total profits generally peak? growth maturity introduction extinction decline$4)$ Landline phones and brick$-$and$-$mortar DVD stores are in the stage of the product life cycle. introduction decline maturity growth extinction