Children typically begin to exhibit simple social play around ____ months of age

The endocrine system is responsible for the production of _____, molecules that influence particular organs

Fill in the blank with correct word

Proactive aggressors believe that

A) their own aggressive behavior is negative and thus, they have low self-esteem. B) aggression will get them what they want, and that the personal cost is likely to be low. C) others are out to get them, so they behave aggressively and swiftly. D) aggression will get them what they want, despite the fact that the personal cost might be high.