Confusion about seats available in science classes?

<p>I've been looking at the "schedule of classes" section of my tritonlink to help me figure out what classes are available so that I will have an easier time registering tomorrow. With some of the science classes I am interested in taking, it shows the number of seats available for the class overall rather than how many seats are available in each individual section. Why is this?</p>

<p>You can attend any section (aren’t assigned to specific ones) or you will sign up for sections later (during Week 1 or 2) through a separate registration process.</p>