Answer:
HIV is a virus that attack the cell which helps to fight against infection and make person suffer from others infections and diseases.
Aquired immunodeficiency syndrome is the Aids caused by HIV virus that is chronic.
If the natural quality of water is destroyed by mixing unwanted and harmful substances in water, it is called water pollution.
B because a flat rate of income tax would hurt the lower class so that doesn’t work. D is incorrect because the progressive movement was against large firms and their corruption. National bank was irrelevant in the 1920s
The Balkans are often referred to as the "Powder keg of Europe" because the area saw a number of smaller events that eventually set off much larger ones, leading to World War I. Look at reference.com.
