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.
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.
Water, oxygen, Nutrition, sleep rest, Love, affection, respect, safety and adequately stimulating Environment are Necessities/ vitals/ essentials for Existence and Meritorious thinking & contributons; Unless spiritually ( example: some suffer lack of Respect because others are yet immature and unable to recognise talent& duly respect it) inspired (love, affection always being steady Constant herein also) , none of the above Necessities can be ignored . All other urges are not necessary for Existence, worthiness and Meritorious living.