Answer:
Autoimmunity
Explanation:
The process by which the body attacks itself is called as autoimmunity. Autoimmune can be described as a immune response of the body that is generated against the bodies own healthy cells and tissues. The diseases which occur due to the cause of autoimmunity are termed as auto immune diseases. Examples of autoimmune diseases include Diabetes mellitus type 1, celiac disease, idiopathic thrombocytopenic purpura, rheumatoid arthritis (RA), Multiple sclerosis (MS).
An air mass is a large volume of air in the atmosphere that is mostly uniform in temperature and moisture. Air masses can extend thousands of kilometers across the surface of the Earth, and can reach from ground level to the stratosphere—16 kilometers (10 miles) into the atmosphere.
Air masses form over large surfaces with uniform temperatures and humidity, called source regions. Low wind speeds let air remain stationary long enough to take on the features of the source region, such as heat or cold. When winds move air masses, they carry their weather conditions from the source region to a new region. When the air mass reaches a new region, it might clash with another air mass that has a different temperature and humidity. This can create a severe storm.
This is a question with 100000 different answers but overall they're testing a hypothesis. <span />
Cell-tissue-organ-organ system
