question: Why were plant populations affected after wolves were eliminated from Yellowstone ?
answer: Without predation , herbivores began to over-graze many woody browse species
turker_answer: After wolves were eliminated from Yellowstone without predation , plant populations were affected because herbivores began to over-graze many woody browse species .
rule-based: Plant populations were affected after wolves were eliminated from Yellowstone without predation , herbivores began to over-graze many woody browse species .