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Function: Prepares the body for rapid action in response to a threat. Evolutionary Significance: Increased chances of survival in dangerous situations.

Function: Promotes behaviors that support the survival of genetic relatives. Evolutionary Significance: Increases the likelihood of one's genes being passed on indirectly.

Function: Selection of a partner for reproduction. Evolutionary Significance: Leads to offspring with better genetic fitness and viability.

Function: Tendency to avoid potential losses. Evolutionary Significance: Preserves life and resources, increasing chances of survival and reproduction.

Function: The time and energy parents expend for their offspring's benefit. Evolutionary Significance: Enhances survival of one's genes by ensuring offspring survival and reproductive success.

Function: Help others with the expectation of future help in return. Evolutionary Significance: Forms social bonds and cooperation which can aid in one's own survival and reproduction.

Function: Finding and acquiring food. Evolutionary Significance: Adapting to maximize nutritional intake while minimizing energy expenditure and risk.

Function: The defense of a bounded space against others. Evolutionary Significance: Secures resources and breeding opportunities, aiding in individual and genetic line survival.

Function: One species evolves to resemble another species. Evolutionary Significance: Provides a survival advantage through camouflage or by imitating dangerous species.

Function: Physical and behavioral adaptations to survive extreme temperatures. Evolutionary Significance: Promotes survival in diverse environments which may enhance gene dispersal.

Function: Learning to avoid harmful stimuli. Evolutionary Significance: Increases chances of survival by avoiding dangers previously encountered.

Function: Asserts dominance, defends territory, or competes for resources. Evolutionary Significance: Can improve mating opportunities and access to resources.

Function: Close and often long-term interactions between different species. Evolutionary Significance: Increases chances of survival for one or both parties via resource sharing or defense.

Function: Decreased response to a repeated stimulus. Evolutionary Significance: Allows organisms to focus on novel stimuli that may pose a greater threat.

Function: Establishes order within social groups. Evolutionary Significance: Reduces conflict, ensures resource distribution, and may increase group survival.

Function: Use of an external object to achieve a goal. Evolutionary Significance: Extends physical capabilities, increasing adaptability and chances of survival.

Function: Vocalizations that alert others to predators. Evolutionary Significance: Enhances the survival of conspecifics, potentially including kin, at some risk to the caller.

Function: Learn new behaviors by observing others. Evolutionary Significance: Speeds up the process of learning and adaptation to environmental changes.

Function: Hormones influence a variety of behaviors related to survival and reproduction. Evolutionary Significance: Facilitates appropriate responses to environmental stimuli and internal states.