Both sentence 1 (you received package) and sentence 2 (you contacted customer service) use the pronoun 'you' correctly as the subject of the sentences.
A substance called DNA (DeoxyriboNucleic Acid) contains the instructions for life.
DNA is the substance within every living cell that contains the instructions for life.
DNA is the substance within every living cell that contains the instructions for life.
DNA contains the instructions to make proteins.
the department of justice contains the immigration and naturalization service.
Department of Commere
heme
The NUCLEUS is the organelle which contains instructions for cell function (source: http://www.win.co.nz/bioweb/ccword.html )
DNA
Click on the cell with the incorrect data and change the data to the correct information.
Proteins
Chromatin contains the instructions for direting the cell's functions. It also contains DNA.