Final answer:
The statement least likely to be associated with the core accretion theory is that adaptive radiation occurs with an increased probability of speciation.
Step-by-step explanation:
The statement least likely to be associated with the core accretion theory is that adaptive radiation occurs with an increased probability of speciation. Core accretion theory is the most widely accepted theory for the formation of planets, including the Earth. It proposes that planets form via the accumulation of solid materials within a protoplanetary disk surrounding a young star. Adaptive radiation, on the other hand, refers to the rapid diversification of species into various ecological niches. Although both concepts are related to evolution, they are distinct from each other.