A typical causal theory is composed of three kinds of laws: zero-force laws, consequence laws, and source laws. The Theory of Natural Selection is not without laws of the first two classes, but its causal content is not necessarily expressed in laws. That content depends, mainly but not exclusively, on the proliferation of local causal invariants, often ephemeral, whose fulfillment is set for each selective pressure that is detected and analyzed. The nature of these selective invariants may be understood in light of a non-nomological conception of causation: the experimental notion of causality.
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