Self-Replicating Probes, Alien Traces in Humanity, and the Rise of Synthetic-Brain Intelligence

To the point

Advanced civilizations could spread through the galaxy with self-replicating probes, humans might be the product of alien engineering or show signs of visitation, and biology-based brains could enable energy-efficient, self-repairing machines for interstellar exploration, while the UAP Science Advisory Council investigates possible visits and collaborates with artist Greg Wyatt.

Would Alien Visitors Possess Intelligence Based on Silicon Chips or Synthetic Biology?
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Would Alien Visitors Possess Intelligence Based on Silicon Chips or Synthetic Biology?

A university student in France asked me the following question: