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.
Tracking number. Tracking numbers are numbers given to packages when they are shipped. Tracking numbers are useful for knowing the location of time sensitive deliveries. In the United States, some of the companies and organizations that use tracking numbers are UPS, FedEx, and the United States Postal Service. Contents.