[Avodah] Reward?

[Rich, Joel]

The beginning of the Aruch Hashulchan states (I think he may be quoting the Smak) Malachim (angels?) have no yetzer hara (evil inclination?), animals have a yetzer hara but no daat (knowledge?). Thus malachim get no schar (reward?) and animals no onesh (punishment?)
Is this knowledge of HKB"H? What does it mean to have a yetzer hara - Is it equivalent of free will? What does it mean to have free will without consequence? How then do we understand the medrash in Breishit that the trees were punished for not following HKB"H's direction? The dogs being rewarded for not barking?

KT
Joel Rich

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