It's about the way you should stand and the way your posture should be. It's also telling you your back is in a slightly 's' shape
,hope this helps answer your question
Radiologist is responsible
The four main types of physical activity are aerobic, muscle-strengthening, bone-strengthening, and stretching.
I don't know if this is what your looking for, but I really hope this helps you?
Answer:Natural barriers and the immune system defend the body against organisms that can cause infection. (See also Lines of Defense.) Natural barriers include the skin, mucous membranes, tears, earwax, mucus, and stomach acid.
Explanation:hope this helps:D happy early hallowen