chorionic villus sampling is removing a peice of the placenta.
amniocentesis is removing amniotic fluid.
Ultrasound is listening for a heartbeat.
and so on
The answer is DNA :) (I think)
True, "Being HIV-positive does NOT necessarily mean you have AIDS. AIDS is the most advanced stage of HIV disease." Source: AIDs.gov
You didn't really provide us with a list or a set of possible answers, however, generally it's very importnat that we have a good and advanced respiratory fitness as this will allow us to go up a flight of stairs faster and without getting out of breath, we are able to run for longer or just do different physical exercises for longer. When our respiratory fitness is weak, this isn't possible.