Hi Najla,
I think so too, that body language add a good deal to your presentation as a whole.
For example, the way you stand up there, in front of everyone, is important.
I think it helps me to find my own stance, one that I'm most comfortable with and I think best conveys me professionally. I don't slouch over or stand with one hand in my pocket all the time. I try to be as relaxed as possible without being too casual. I try not to pace too much and try to make eye contact with my audience as appropriate.
All of this I find quite helpful during presentation.
Any other thoughts?