The Balkans were a region of diverse ethnic groups and nationalist aspirations, creating significant tensions in Europe after 1871. A large portion of the Balkans was under Ottoman rule, and various nationalist movements sought independence, which was often supported or opposed by major European powers based on their strategic interests. This combination of ethnic diversity and external intervention made the Balkans a flashpoint for nationalist conflicts.
List any three techniques of contraception used by humans. Which one of these is not meant for males?
Why are testes in human males located outside the abdominal cavity in scrotum?
Define Puberty. List any two changes seen in boys at the time of puberty.
What are soaps? Write the structure of a soap molecule. Explain the cleansing action of a soap. Why are soaps not considered suitable for washing clothes in a region where water is hard? How is this problem overcome?
Name an alcohol and a carboxylic acid having two carbon atoms in their structures. Draw their structures and state how this alcohol and carboxylic acid can be converted into a carboxylic acid. What happens when these two compounds react in the presence of an acid? Write chemical equations for the reactions involved in the two cases mentioned above.