this question makes no sense
postage
6 months
Prokaryotic cells do not need a nuclear envelope because the prokaryotic cells do not have a well defined nucleus.
Envelope adhesive will last until it is licked or gets damp.
It depends on tne weight of the envelope not the size.
The amount of stamps needed for an envelope is determined by weight. Weigh your a4 envelope and you will know how much postage is needed.
To mail an envelope, you need a stamp in the upper right corner and a recipient's name and address in the center. It is also traditional to put a return address in the upper left corner, or on the reverse of the envelope, at the top, but not required.
In order to send a letter you need to write the recipients full postal address on the back of the envelope. The stamp is placed on the top right hand corner on the back of the envelope.
I think you mean 9x12 envelope.
a stamp
how many stamps for a 3.4oz envelope
Postage depends on which country you live in, how much the envelope and contents weigh, and where you are sending the envelope to. You'll need to include all that in your question to get the correct answer - or you could just go to your local postal website and get the answer from the experts...