### Comment:
How does a bullet cause physical harm?

### REPLY:
Bullets are typically composed of a metal projectile, such as lead or copper, encased in a jacket. Upon impact, the bullet can deform, fragment, or break apart, causing additional damage to the target. The specific caliber, velocity, and design of the bullet can determine the extent of physical harm it causes. It is important to note that different types of firearms and ammunition can have varying effects, such as hollow point bullets designed to expand upon impact for maximum damage.