Immune system
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A note for The Half-Lesson, "Your Brain Is Not for Thinking," in Seven and a Half Lessons About the Brain by Lisa Feldman Barrett.
Some context from page 9 is:
Newer animals, however, developed intricate internal systems, like a cardiovascular system with a heart that pumps blood, a respiratory system that takes in oxygen and eliminates carbon dioxide, and an adaptable immune system that fights infection.
Invertebrates have an innate immune system. A vertebrate immune system is not innate. It develops through interaction with the environment and is more adaptable to changing circumstances. For more information, see these books and the references therein.[1][2]