Difference in function between the innate and adaptive immune systems

What is the difference in function between the innate and adaptive immune systems?

Innate immunity is an inborn, phylogenetically conserved system that allows the host to rapidly respond to a pathogen within 20 to 30 minutes of exposure. This system is inflexible in that only specific pathogen features will result in a response. In contrast, adaptive immunity develops over 3 to 5 days following pathogen exposure. Yet, this system is flexible, allowing refinement of the lymphocytes’ abilities to target the pathogen.

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