'Do' and 'does' are both forms of the present indefinite tense of your verb 'to carry out.' Which just one you may use will primarily depend on the sentence's subject matter. Their usage is almost identical, aside from a single occasion where You need to use 'do' rather than https://financefeeds.com/smart-moneys-watching-these-4-best-copyright-to-buy-this-week-before-the-trend-catches-on/