In the process of evolution by natural selection illustrated in this figure, what is the mechanism or agent of natural selection? 
Definitions:
Frontal Lobe
The front part of the brain, which makes plans and considers decisions.
Big Five
A conceptual model in the field of psychology, highlighting five key personality characteristics: openness, conscientiousness, extraversion, agreeableness, and neuroticism.
Full Siblings
Individuals who share both biological parents, having a full genetic overlap of 50% on average from each parent.
Genetics
The branch of biology that deals with the study of genes, genetic variation, and heredity in organisms.
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