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.
I take my shipments to the post office. I ship media mail, 1st class parcel, standart post & priority. I never purchase tracking because on the USPS receipt is a 22 digit # and even though USPS says there is no tracking with the number, when I upload the number on eBay or go to the USPS website it shows tracking.