Question

large - diameter, densely packed myofibrils, large glycogen reserves, and few mitochondria are characteristics of fast fibers. fatty muscles. intermediate fibers. red muscles. slow fibers.

Explanation:

Fast - twitch muscle fibers have large - diameter, densely packed myofibrils, large glycogen reserves for quick energy release, and few mitochondria as they rely more on anaerobic metabolism.

Answer:

A. fast fibers