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.
How to track USPS priority mail express? United States Postal Service assigns a unique number to each mail item or package that is shipped through USPS. This number is called USPS Tracking Number, use this number to track your mail item. Visit the official website of US Postal Service i.e. USPS.com to track your priority express mail package.