Marcus is the son of a teenage mother. She could not handle taking care of him and put him up for adoption when he was 4 weeks old. Marcus was adopted by a family that loves and cares for him. It is MOST likely that Marcus will:

It is most likely that Marcus will become an abusive parent with aggressive tendencies.

Explanation:

Research shows evidence of the so-called cycle of abuse. That means abuse tends to be repeated by a child who has been a victim when that child grows up. If children are abused or witness violence in their households, they will most likely repeat the aggression when they have their own families. Marcus has not been exposed to a healthy role model when it comes to having a family. Not only was he left and abused, he was never adopted by caring and loving parents. Therefore, chances are that he will end up perpetuating the cycle of abuse.

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this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.