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The second theory is similar and is known as "evolutionary neuroandrogenic (ENA) theory of male aggression". [77] [78] Testosterone and other androgens have evolved to masculinize a brain in order to be competitive even to the point of risking harm to the person and others. By doing so, individuals with masculinized brains as a result of pre-natal and adult life testosterone and androgens enhance their resource acquiring abilities in order to survive, attract and copulate with mates as much as possible. [77] The masculinization of the brain is not just mediated by testosterone levels at the adult stage, but also testosterone exposure in the womb as a fetus. Higher pre-natal testosterone indicated by a low digit ratio as well as adult testosterone levels increased risk of fouls or aggression among male players in a soccer game. [79] Studies have also found higher pre-natal testosterone or lower digit ratio to be correlated with higher aggression in males. [80] [81] [82] [83] [84]

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Kraft, S. (.). Signs of high testosterone in women. Retrieved from  http:///content/article/signs-high-testosterone-women

Low testosterone. (2012, March). Retrieved from  http:///diseases-and-conditions/mens-health/low-testosterone

Nigro, N. & Christ-Cain, M. (2012). Testosterone treatment in the aging male: Myth or reality? Swiss Medicine Weekly, 2012(142), w13539. Retrieved from  http:///content/smw-2012-13539/

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Sharma, R., Oni, O. A., Gupta, K., Chen, G., Sharma, M., Dawn, B., … & Barua, R. S. (2015, August 6). Normalization of testosterone level is associated with reduced incidence of myocardial infarction. European Heart Journal, 36(40), 2706-2715. Retrieved from  https:///eurheartj/article/36/40/2706/2293361/Normalization-of-testosterone-level-is-associated

Sinicki, A. (.). What are prohormones? Are they safe? Retrieved from http:///entry/17328/1/What-Are-Prohormones-And-Are-They-

Testosterone and androgens. (2014, January). Retrieved from  http:///hormones-and-health/hormones/testosterone

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Wein, H. (2013, September 23). Understanding how testosterone affects men. Retrieved from  https:///news-events/nih-research-matters/understanding-how-testosterone-affects-men

What is low testosterone (hypogonadism)? (.). Retrieved from  https:///urologic-conditions/low-testosterone-(hypogonadism)

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An animal defending against a predator may engage in either " fight or flight " in response to predator attack or threat of attack, depending on its estimate of the predator's strength relative to its own. Alternative defenses include a range of antipredator adaptations , including alarm signals . An example of an alarm signal is nerol, a chemical which is found in the mandibular glands of Trigona fulviventris individuals. [25] Release of nerol by T. fulviventris individuals in the nest has been shown to decrease the number of individuals leaving the nest by fifty percent, as well as increasing aggressive behaviors like biting. [25] Alarm signals like nerol can also act as attraction signals; in T. fulviventris, individuals that have been captured by a predator may release nerol to attract nestmates, who will proceed to attack or bite the predator. [25]

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An animal defending against a predator may engage in either " fight or flight " in response to predator attack or threat of attack, depending on its estimate of the predator's strength relative to its own. Alternative defenses include a range of antipredator adaptations , including alarm signals . An example of an alarm signal is nerol, a chemical which is found in the mandibular glands of Trigona fulviventris individuals. [25] Release of nerol by T. fulviventris individuals in the nest has been shown to decrease the number of individuals leaving the nest by fifty percent, as well as increasing aggressive behaviors like biting. [25] Alarm signals like nerol can also act as attraction signals; in T. fulviventris, individuals that have been captured by a predator may release nerol to attract nestmates, who will proceed to attack or bite the predator. [25]

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