Show the reagent(s)needed to complete the following reaction. 
Definitions:
Homeostasis
The tendency of a biological system to maintain stability while adjusting to conditions that are optimal for survival.
Systems Perspective
An approach that views problems and solutions holistically, considering the interconnections and interactions among components within a system.
Equifinality
A principle in systems theory suggesting that a final state can be reached from different initial conditions and through different pathways.
Negative Entropy
A concept in systems theory, indicating systems' tendency towards organization and complexity, contrasting with the concept of entropy in thermodynamics.
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