MDR TB is a particular type of drug resistant TB. It means that the TB bacteria that a person is infected with are resistant to two of the most important TB drugs, isoniazid (INH) and rifampicin (RMP). If bacteria are resistant to certain TB drugs this means that the drugs don’t work.
They are saying that every theory can eventually be changed a bit due to further research. It does not mean the theory is bad, just that it can become better.
The correct answer is A. It was in my biology studyguide and also all these coil and gasses pollute the air that is why we are trying to become electrical
