Yes, if so marked
It was made in 1954 and is chambered for 2 3/4" 16 ga shells.
Not sure excactly what the question is. All Browning Sweet Sixteens (imported to Browning) after WWII are chambered for 2 3/4 16ga shells. The barrels are mared as such. Prior to 1941, Sweet 16's and Standard 16's were chambered for 2 9/16" shells.
13-14"
The only way to know is to shoot and adjust
The Sweet Sixteen Shotguns were a model of the Browning A-5 Auto. They were made between 1937 and 1975. That does not appear to be a complete serial number.
They were made in 24". 26", 28" and 30"
Brownings made prior to the Second World War could have been chambered in 16 ga, 2-9/16" length. That is no longer a standard SAAMI length and I know of no US companies who load it. You may be able to find a hand loader who can make them for you, you can investigate the European cartridge companies to see if there is a European equivalent, or you can have the gun converted to shoot the longer 2-3/4" shells.
Yes, sweet basil seeds can germinate in the dark. While some seeds require light to germinate, sweet basil seeds do not have this requirement and can germinate in the absence of light.
It was made in early 1947. One of the first to be chambered for 2 3/4" shells.
No way to answer without a sn, condition and bbl length.
During the 6th week of pregnancy, the embryo is typically around 5-6 mm in length, which is about the size of a sweet pea or a lentil.