Are there any rules or conventions on when to omit を (as in 1) or が (as in 2) when it comes to embedded questions?
- この生物は何か教えてください。
- どれがおいしいかまずいかさっぱりわかりません。
My gut feeling would be to generalize and say that the particles are mostly dropped in spoken /more casual language and kept in written/ more formal language, but honestly I feel like I've seen them dropped relatively frequently even in written language so I am unsure... Any thoughts?