Does the sentence "Cyril and Methodius University of Skopje in Macedonia and Strachimir Mavrodiev from the Bulgarian Academy of Sciences attempted to establish a "time prediction method" through collecting statistics on geomagnetism with tidal gravitational potential." provide a valid answer to the question "What did they try to establish?"

A: yes

Does the sentence "Arab nationalist terms such "Arab homeland" and "Arab nation" frequently began appearing in his speeches in 195455, whereas prior he would refer to the Arab "peoples" or the "Arab region"." provide a valid answer to the question "Who were Umm Kulthum and Abdel Hafez?"

A: no

Does the sentence "Greece is classified as an advanced, high-income economy, and was a founding member of the Organisation for Economic Co-operation and Development (OECD) and of the Organization of the Black Sea Economic Cooperation (BSEC)." provide a valid answer to the question "What organization was Greek a founding member?"

A: yes

Does the sentence "Polyphonic vocal genres, which used multiple independent vocal melodies, began to develop during the high medieval era, becoming prevalent by the later 13th and early 14th century." provide a valid answer to the question "What genre uses multiple independent vocal melodies?"

A:
yes