Studying questions such as the cognitive ability and behavior of clones is of major importance, but its hard to draw conclusions just yet, scientists say.

研究克隆动物的认知能力和行为等这样的问题很重要，但是科学家们说目前还很难得出结论。

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"Dopamine is considered a neurotransmitter that is crucial for our ability to perceive rewards and to be motivated in our behavior."

VOA: special.2009.09.16

Now he would just like to walk again. TBI can lead to physical disabilities as well as changes in mental ability, personality and behavior.

VOA: standard.2010.05.25

The education of our women and their ability to be high-income earners have altered social behavior and led to marriages later in life.

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Why is it that after all our ability to study world history and human behavior in the many schools of higher learning that we have that we are so ignorant of the most obvious?

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So given our susceptibility to emotional behavior and our limited ability to grasp and process news, individual investors may feel overwhelmed.

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