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The Meaning of pikaia means primitive chordate.
Pikaia
Pikaia is a significant fossil from the Cambrian period, approximately 505 million years ago, notable for being one of the earliest known chordates, which are animals with a backbone. It resembles a primitive fish and exhibits key features such as a notochord, a precursor to the backbone, and a segmented body structure. Pikaia provides crucial insights into the evolution of vertebrates, highlighting the transition from invertebrates to more complex life forms. Its discovery helps scientists understand the early stages of animal evolution and the development of key anatomical features.
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.
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.
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.
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