Final answer:
Aggressive and assertive behavior is often linked to increased levels of androgens, particularly testosterone, which influences such behavioral patterns.
Step-by-step explanation:
Increased aggressive and assertive behavior is typically associated with an increase in androgens, which are a group of hormones that play a role in male traits and reproductive activity. The most well-known androgen is testosterone. Androgens are known to influence behavior patterns, especially in relation to aggression and dominance.