There are two parts to every command. They are: (one) the preparation and (two) the execution.
The preparation tells the band what they are about to do. The execution tells them to do it. For example...
"Band...Atten (preparation) Hut!" (execution)
"Mark Time (preparation) Hut!" (execution)
"Band.....Parade (preparation) Rest!" (execution)
Both parts of every command must be done to complete a proper command. The Band/Corps must know what they are supposed to do and when they should do it.
Since whistle commands evolved from oral commands, they also have the same two parts. Usually the preparation whistle is done while the drum major does some type of signal with a baton or mace. The execution whistle is a short whistle, or series of short whistles that tells the band to do the command.
Make sure that every command is done clearly and has both a preparation and execution. This will keep your band/corps executing your comma
The two main parts of setting are time and place.
the two major parts of science is probably life science and technology.
two axles
There are more then two parts. Get a book. I would suggest the book "Feline Anatomy." Unless you are refering to the vagina. If that is the case, see the first answer.
hahahahahahahahahah. People, trees ,grass ,plants, etc. The living parts of an ecosystem is the biotic factors.