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 International Mail With Custom Label Numbers. By Chuck Ayers ; Updated April 09, 2017. USA web image by Alexander Potapov from Fotolia.com. Two kinds of mail can be tracked internationally when sent from the U.S. to a foreign county: Registered Express Mail and Global Express Guaranteed Mail.