If there are a lot more females then males in a country, there could be a rise in births, and if it is serious it could lead to an overpopulation problem. If there are more males there could be a lack of births, and the infrastructure could be compromised. In both cases specific gender-related jobs could be in short supply or there might not be enough workers for a steady economy.
Answer: Evolutionary Psychology Explains Behavioral Skills
The ability to communicate complex thoughts was beneficial for human survival, and, as a result, language acquisition abilities evolved and advanced through the process of natural selection
Prejudice is a major cause of in-groups as similar minded people, with alike prejudices, might join to form a clique. Some consider cliques to be a social norm, and to "fit in", they feel compelled to join one. Scapegoating a common tactic used by mobs to blame one, or a few individuals, even if there isn't sufficient evidence to prove guiltiness. Equal status contract explains why people form cliques and why they can act hostile to others, but not to people in their "group". Using attribution theory, one can model a situation to determine the causes of actions and behaviors.
Frogs is the answer.......... :)