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 Certified MailÂ® labels are assigned article numbers that consist of numbers that begin with a 70, 71 or new technology codes using the digital postmark may begin with a 94. An example of this type of number is 9414815901016802011146. This is the USPS Certified Mail&reg; article number. If you mistakenly try to track a FedEx tracking number into USPS it smart enough to tell you of the error, and inform you the tracking number was an invalid USPS tracking number.