UG could evolve from non-linguistic cognitive capacities (hierarchical planning, social reasoning) already present in primates without requiring homologous communication structures.

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Cognitive capacities(philosophy of mind and epistemology): Your mental abilities to think, learn, understand, and process information.
Hierarchical planning(as used in cognitive science): The ability to break down a big goal into smaller steps and organize them in order of importance—like planning a project by figuring out what needs to happen first, second, and third.
Homologous structures(as used in evolutionary biology): Body parts or systems in different species that came from a common ancestor and serve similar functions—like how human arms and bat wings have the same basic bone structure even though they look different.
Primates(referring to other species we share evolutionary family with): A group of mammals that includes humans, apes, monkeys, and lemurs—animals that typically have grasping hands and forward-facing eyes.

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