Questions

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.

A solar eclipse happens when the moon gets in the way of the sun's light and casts its shadow on Earth. Solar eclipses happen when the New Moon comes between the Sun and Earth and blocks out the Sun's rays.