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.
Service Code. The next three digits of the USPS tracking number indicate the type of service requested. Previous versions of the USPS software used a two-digit service code; this field has expanded to three digits. You can look at these three numbers and instantly determine the type of mailing service used.