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.
USPS Tracking is a Courier service which Track all your USPS shipments and Packages , you will get notified real-time tracking information via Tracking number and come to know the exact delivery time with the accurate information regarding Packages tracking in United States Postal Service .