How did stone tools change over time? why do you think these changes took play so slowy?

Because they bonded other materials to it

The first tools were sharpened stones. They later developed better tools such as the hand ax made out of flint. Later they also learned to attach wooden handles to tools. These changes took place slowly as the early humans found new purposes for their tools.

authors choose a genre based on their purpose. fiction works well for teaching a lesson, as in fables. however, presenting facts and opinions in nonfiction might be a better way to present information. when authors begin to write, they think about what they want the reader to understand or experience. while fiction may be the best genre for storytelling, nonfiction may be the most clear for sharing facts, so both genres have merits.