3.Which is a time before historical events were written down?long agoprehistorictomorrowyesterday

Break Down the Problem

1. Identify the key terms in the question.
2. Determine what is meant by "time before historical events were written down."

Relevant Concepts

1. The term "prehistoric" refers to the time period before written records were kept, encompassing a long span of human history from early human life to the invention of writing.

Analysis and Detail

1. "Long ago" generally refers to an unspecified time in the past but does not specifically indicate a lack of written records.
2. "Tomorrow" and "yesterday" are relative terms that refer to the present context of time and are not relevant to the understanding of history.
3. Prehistoric times are specifically categorized as times before the advent of writing systems, making the term "prehistoric" the best choice.

Verify and Summarize

• The answer must reference a term that indicates a lack of written records related to human history, which is clearly defined by "prehistoric."

Final Answer

Prehistoric is the correct answer as it specifically denotes the time before historical events were documented.