Simplify the following text for a Grade 8 native English-speaking person.
Original: Arrowheads are attached to arrow shafts to be shot from a bow ; similar types of projectile points may be attached to spears and `` thrown '' by means of an Atlatl ( spear thrower ) .
Simplified: Arrowheads are attached to arrow shafts and may be `` thrown '' ( similar to a spear thrower ) , or fired from a bow .