A cell that carries out the final response or function of a particular process. The main effector cells of the immune system, for example, are activated lymphocytes and phagocytesâthe cells involved in destroying pathogens and removing them from the body.
Best Answer: Yes you can track it online here: https://tools.usps.com/go/TrackConfirmAc... The tracking number should look like this: CP 000 000 000 US. You can find it on the receipt, and the customs form you filled out.
Track certified mail from the U.S. Postal Service by using tracking tools on the USPS website. You need the tracking number for the package in order to use this service. Alternatively, send a text message to 28777 with your tracking number to receive updates as your mail travels. Continue Reading.