Answer: mete el dedo en el culo
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Explanation:
Humans change their environment both positively and negatively and the environment affects how humans live in many different ways. The main interactions between humans and our environment can be grouped into the use of resources and the production of wastes.
Serfs were mostly peasant farmers who provided labor in their masters land. Peasants would pay the lord by working for them in exchange to use their lords land to generate their own food. Serfs did not have money. they were basically slaves. They would work at least three times a week. The serf was bound to work in a single manor. The status of serf was passed down to their children.
Actually every single one is correct, A<B<C they all are factors in the decline of Sumer.
