Yes it is. This is because during the warmup you are quite literally "warming up" your muscles and ligaments through stretching. Also, many like to incorporate some light cardio into their warmup. Without a warmup you are more prone to injury and will not have a good performance during the main section of your workout, especially if you are lifting.
Not sure but probably cognitive it fits the best
In a major incident, personnel and equipment should be dispatched even without being requested.
if this is wrong notify me right away.