The biological factors of suicide among the options provided are:
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Low levels of the neurotransmitter serotonin: Research has shown that low serotonin levels are associated with increased risk of suicidal behavior.
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Genetic factors: There is evidence that genetic predisposition can play a role in an individual's risk for suicide.
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Poor physical health: Chronic illnesses and conditions can contribute to mental health issues, which may increase suicide risk.
The option the loss of a loved one through death, divorce, or separation is more of a psychological or social factor rather than a biological one.
Therefore, the biological factors among the options listed are low levels of serotonin, genetic factors, and poor physical health.
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