Question

multiple choice question
the brain is shaped:

through external factors but only in early life

purely by genetics

by skill learning throughout most of a persons life

Explanation:

The brain's development (shaping) isn't purely genetic (so "purely by genetics" is wrong) and isn't limited to early life for external - factor - based shaping (so "through external factors but only in early life" is wrong). Neuroplasticity shows the brain can change via learning/experiences across most of life, so this option is correct.

Answer:

by skill learning throughout most of a person's life