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 is a bar code that is printed on your shipping label or Printed on the Slip or Bill you get from the courier services. This Bar Code allows the Customer to Track How your Item Moves from city to city to reach you. That's the only information every customer eagerly wants to know.