Final answer:
Anyanwu's power manifests from a young age due to her genetic mutation, allowing her to shapeshift and take on the characteristics of other living beings.
Step-by-step explanation:
Anyanwu's power manifests at a young age, typically during childhood. Her ability to shapeshift and take on the characteristics of other living beings is a result of her genetic mutation, which is present from birth.
For example, in Octavia Butler's novel Kindred, Anyanwu is shown to have her powers from a young age when she transforms into various animals to escape danger or help others.
This manifestation of power is explained by the fact that genetic mutations can occur at any point during development, including in early embryonic stages.