How does Megaphragma mymaripenne achieve extreme miniaturization during its transition from pupa to adult?

• A. By losing more than 95 percent of its nerve cell nuclei
• B. By halving its brain size
• C. By absorbing nerve cells into muscle tissue
• D. By using miniature neurons

Answer: (A)

Megaphragma mymaripenne achieves extreme miniaturization by enucleating most nerve cells during the pupal stage. More than 95 percent of the nerve cell nuclei are destroyed, leaving a vast majority of neurons without nuclei (enucleated neurons) but with cytoplasm and neural processes intact. This dramatic reduction in nuclear material drastically lowers the brain’s volume and metabolic demands, allowing the insect to develop a minuscule adult body while still preserving essential neural function. The other ideas don’t fit because the brain isn’t simply halved in size, neurons aren’t absorbed into muscle tissue, and there aren’t genuinely miniature neurons used to achieve the same function.