Does the sentence "Deuterium was discovered in December 1931 by Harold Urey, and tritium was prepared in 1934 by Ernest Rutherford, Mark Oliphant, and Paul Harteck." provide a valid answer to the question "Who was the first to discover deuterium?"

A: yes

Does the sentence "Historically, the population of Tibet consisted of primarily ethnic Tibetans and some other ethnic groups." provide a valid answer to the question "What has the population of Tibet primarily consisted of?"

A: yes

Does the sentence "The fertilization and development takes place inside the egg, enclosed by a shell (chorion) that consists of maternal tissue." provide a valid answer to the question "Chorion is another word for what?"

A: yes

Does the sentence "When North Korea declared its intention to do this the Secretary-General of the United Nations, acting as registrar, said that original signatories of the ICCPR had not overlooked the possibility of explicitly providing for withdrawal, but rather had deliberately intended not to provide for it." provide a valid answer to the question "What two factors determine whether it is possible to withdraw from a treaty?"

A:
no