question: What did Thomas Malthus ' book theorize would happen to human populations if they were unrestrained ?
answer: breed beyond their means and struggle to survive
turker_answer: Thomas Malthus ' book theorized human populations would breed beyond their means and struggle to survive if left unrestrained .
rule-based: Breed beyond their means and struggle to survive did Thomas Malthus ' book theorize would happen to human populations if they were unrestrained .