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Why do exaptations provide challenges to evolutionary biologists' attempts to generate testable hypotheses about how natural selection produces adaptations?
Pacemaker Cells
Specialized cells within the heart's sinoatrial node that generate and regulate the heart's rhythm.
Enteric Sensory Neurons
Nerve cells within the enteric nervous system that detect changes in the gastrointestinal tract and send information to the central nervous system.
Digestive Tract
The series of hollow organs joined in a long, twisting tube from the mouth to the anus, where food is broken down, nutrients are absorbed, and waste is expelled.
Adipose Tissue
A type of body tissue containing stored fat, serving as an energy reserve, padding and insulation for the body.
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