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 free when purchased at the Post Office. USPS Tracking can be combined with other services, including Return Receipt, Return Receipt for Merchandise, Collect on Delivery (COD), Domestic Insurance, Registered Mail, Restricted Delivery and Special Handling.