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The Meaning of pikaia means primitive chordate.
Pikaia
Changed how? literally change out the characters with new characters or physical characteristics changed? Neither were necessary.
The first vertebrate was Pikaia, which lived 510 million years ago, 280 million years BEFORE dinosaurs.
The physical descriptions helps the reader visualize the characters. This also applies to backgrounds, sceneries, atmospheres, items and anything else in a novel.
A physical change is simply, a temporary change, which changes the physical characters of an object like its color, shape, size etc. It is a reversible change.
Pikaia, an early Cambrian organism, likely fed on small organic particles suspended in the water column, such as algae or microscopic organisms. Its feeding strategy was probably similar to that of modern filter-feeding organisms found in marine environments.
context
context
In this allegory, the spiritual dimension is often represented by abstract concepts such as love, truth, and morality, which guide the characters' actions and decisions. The physical dimension is represented by the characters' physical journey, their interactions with the world around them, and the obstacles they face in their quest for enlightenment.
Physical traits is what they look like + Personality traits is what they act like
genes are passed down fron one to next generation. Not the physical characters.