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Based on the research of Martín Sánchez-Jankowski, what are the primary reasons urban male youth join gangs?
Dinosaurs
A diverse group of prehistoric reptiles that lived during the Mesozoic Era, now extinct.
Mass Extinctions
Events in Earth's history where large numbers of species become extinct in a relatively short period of time.
Fossil Record
The collection of all known fossils and their placement in rock formations and sedimentary layers, providing evidence of past life and evolutionary histories.
Protocells
Simple, self-organized, prebiotic structures that are considered the precursors to living cells.
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