Problem: Does "The Ninth asks for a second pair of horns, for reasons similar to the "Eroica" (four horns has since become standard); Beethoven's use of piccolo, contrabassoon, trombones, and untuned percussionplus chorus and vocal soloistsin his finale, are his earliest suggestion that the timbral boundaries of symphony should be expanded." answer the question "PIccolo, contrabassoon, and trombones add to the triumphal finales of what piece by Beethoven?"

A: no

Problem: Does "Since chlorinated hydrocarbon pesticides dissolve in fats and are not excreted, organisms tend to retain them almost indefinitely." answer the question "Why are hydrocarbon pesticides not excreted?"

A: yes

Problem: Does "The Great Plains ecoregion includes five sub-regions: Temperate Prairies, West-Central Semi-Arid Prairies, South-Central Semi-Arid Prairies, Texas Louisiana Coastal Plains, and Tamaulipus-Texas Semi-Arid Plain, which overlap or expand upon other Great Plains designations." answer the question "what countries is the Commission for Environmental Cooperation made up of?"

A:
no