Does the sentence "Scientists discovered a skin-lighting mutation that partially accounts for the appearance of Light skin in humans (people who migrated out of Africa northward into what is now Europe) which they estimate occurred 20,000 to 50,000 years ago." provide a valid answer to the question "What mutation did scientists discover?"

A: yes

Does the sentence "Some authorized services, such as Beatport, Bleep, Juno Records, eMusic, Zune Marketplace, Walmart.com, Rhapsody, the recording industry approved re-incarnation of Napster, and Amazon.com sell unrestricted music in the MP3 format." provide a valid answer to the question "What kind of MP3 file sharing continues on?"

A: no

Does the sentence "According to a study by the China Earthquake Administration (CEA), the earthquake occurred along the Longmenshan fault, a thrust structure along the border of the Indo-Australian Plate and Eurasian Plate." provide a valid answer to the question "On which fracture did the quake focus?"

A: no

Does the sentence "The government also opened access to the sealed ruins of the Beichuan county seat for three days, after which it will be frozen in time as a state earthquake relic museum, to remind people of the terrible disaster." provide a valid answer to the question "Where did the government open access to?"

A:
yes