Q: Does "Crevasses form due to differences in glacier velocity." provide a valid answer to "Why are glacial crevices formed?"?
A: yes

Q: Does "At present, only a few LEDsextremely bright LEDs that also have a tightly focused viewing angle of 8 or lesscould, in theory, cause temporary blindness, and so are classified as "Class 2"." provide a valid answer to "How are most LEDs classified?"?
A: no

Q: Does "A comparison of the genes of M. tuberculosis complex (MTBC) in humans to MTBC in animals suggests humans did not acquire MTBC from animals during animal domestication, as was previously believed." provide a valid answer to "What does MTBC stand for?"?
A: yes

Q: Does "A door within the vestibule dates from around 1050 and is believed to be the oldest in England.[citation needed]" provide a valid answer to "A door in the vestible dates back to when?"?
A:
yes