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On the topic of defining behavior, a definition that may be pausible is "anything that an organism does involving action and response to stimulation" given by merriam webster dictionary. Basically it is saying that behavior is the output to any given input. Which means that not only do girls act differently than boys but each individual behaves differently than the next.

However if it is looked at from a more general persepctive than overall I think it can be said boys and girls act differently because the general response for girls to certain inputs is portrayed as the same as is the case with the general response for boys to a certain input. This genralization however may be outdated, because there is starting to be more variation in responses boys are maybe more able to show emotion and girls are less squimish. So maybe intodays world it is becoming more of a mix in how girls and boys respond to inputs or behave.