In relationships , Teaming has a different effect upon one's Atoms, molecules and excitement than does enmity: Physiology is affected by one's thinking and Spiritual choices at deeper level. Immortality of physiology is possible through Unity oneness with Immortal loving truth essence ( already prevalent in all Sentience spirit energy). Some scientific groups have been propounding the Reality of Immortality ( favorable eternal Loving existence) of spirit, soul and body.
Companionship is based upon Affection, intrinsic Qualities of Empathy and Bonding. All animals, birds fowl , fish, squirrel care for their young with Affection: indication that they are Empathetic. Dogs , Hens manifest deep Companionship ( loyalty, concern, understanding, affableness, friendship): Intrinsic Qualities. Some humans are Empathetic.
When a being passes away, the Emotions Thoughts in her "spirit energy" is yet existing; Since it's 'spirit energy' that enlivens a physical body ( keeps it alive and gives it the ions& photons etc. manifestation), the Desire (& intensity) for Immortality Love ( Affable) in the 'spirit energy' is able to influence the physicality accordingly ( towards Immortality). A beyond 'time, space, matter ' characteristic, Immortality is possible in immediate, in future and in same Locale or another.