Invasions by the barbarian tribes.
        
             
        
        
        
The right answer is prefrontal cortex. This area of the brain is responsible for controlling impulses, decision making and reasoning. Mature between 18 and 25 years, and may even take longer to mature, which is why sometimes emerging adults perform risky actions or impulsive actions.
I hope my answer can help you.
        
             
        
        
        
Development states and making a personal investment in attaining that identity.
James Marcia's developmental theory believes that identity arises from the set of choices people usually make during adolescence. These choices about ideology, profession, relationships, hobbies, and gender that one has incorporated into one's identity are subject to conflict and attachment.
Marcia (1966) based on Ericsson's (1950/1980) psychosocial identity development theory of adolescent identity development, four identities: identity diffusion, identity partitioning, identity moratorium, and identity acquisition. The state has been identified.
(2005) empirically derives an identity status similar to that described by Marcia (1966). They develop both commitment and exploration in two forms each, distinguishing the next four dimensions of identity. Commitment creation, commitment identification, width exploration, and depth exploration and making personal investment.
Learn more about personal investment at
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Answer:
c. opportunity cost 
Explanation:
opportunity cost is the economic term for the value od the second-best ternative that an individual gives up when making a choice
 
        
             
        
        
        
Answer:    Wendy's schema of how a typical beach looks includes shells
Explanation:  The psychological concept of a scheme implies that a particular image of something according to the scheme should look a certain way. This actually means that the brain connects a certain knowledge or experience to a particular event or object, subject, etc. Based on a certain knowledge or experience, one approaches a meaningful, known scheme, leading to known actions. So Wendy draws a picture of a beach with shells based on her beach experience or some previous beach image and approaches drawing with an understanding of the beach she already has.