Questions

The difference between exports and imports is called the balance of trade. If imports are greater than exports, it is sometimes called an unfavourable balance of trade. If exports exceed imports, it is sometimes called a favourable balance of trade.

AIDS is caused by the Human Immuno deficiency Virus (HIV), a member of a group of viruses called retrovirus, which have an envelope enclosing the RNA genome. Transmission of HIV-infection generally occurs by (a) sexual contact with infected person, (b) by transfusion of contaminated blood and blood products, (c) by sharing infected needles as in the case of intravenous drug abusers and (d) from infected mother to her child through placenta.