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What will happen in the absence of chance events.
In evolutionary biology deterministic results are mediated by natural selection. That is, given the current state of a system, natural selection determines what will happen to the system through time in the absence of unforeseen events. See by contrast stochasticism.
In biochemistry, determinism describes the majority of what the system does, with the more knowledge available about the system then the greater amount about it that will be understood in terms of how the system will behave over time.
In evolutionary biology, systems operate deterministically in the absence of mutation and migration, and given infinite population sizes along with environment over which those infinite populations can exist. Otherwise the system operates as only an approximation of deterministically; that is, we know what will likely happen but cannot predict that likelihood with 100% certainty.
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