Does the sentence "This employed an inverted pendulum that, when disturbed by ground tremors, would trigger a set of gears that dropped a metal ball from one of eight dragon mouths (representing all eight directions) into a metal toad's mouth." provide a valid answer to the question "What was exchanged from mouth to mouth in the usage of the seismometer?"

A: yes

Does the sentence "Yale and Yale-New Haven are also among the largest employers in the state, and provide more $100,000+-salaried positions than any other employer in Connecticut.[citation needed]" provide a valid answer to the question "What percentage of New Haven's economy is based in services grounded in health care and education?"

A: no

Does the sentence "The effect of these differences was accentuated by the pre-war preparations." provide a valid answer to the question "The effect of German victory and ensuing influence stems back to what factor?"

A: yes

Does the sentence "A similarly comprehensive study of over-the-counter products began ten years later." provide a valid answer to the question "What did the National Academy of Science's study discover?"

A:
no