Answer:
Although not fully understood, low back pain problems are usually linked to two areas: 1) lifestyle, which includes stress, lack of exercise and poor posture, and 2) physical injury or disease. Stress can be a precursor to low back pain by upsetting your nervous system, causing your muscles to go into spasm.
Explanation:
It is found in combustion fumes (by cars and trucks), portable generators, wood burning stoves, gas ranges and heating systems.
Hope this helps and have a great day! :D
13 is c. 14 is d. and 15 is b
