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 Number Format. The most common USPS tracking format is a 20 digit number (e.g. 9999 9999 9999 9999 9999), or a combination of 13 alphabets and numeric characters. Which usually starts with two alphabets, which is followed by a 9 digit number and ending by âUSâ (e.g. EA 999 999 999 US).