Historians use terms such as A.D, B.C, decade, and century to refer to periods of time. The correct answer is B, periods of time.
Samuel Morse was knowed by B. Inventing the telegraph
Answer:
sending mail by bird
Explanation:
stapled to a bird and let fly away
Answer you're looking for is A. Disease epidemics during peacetime have resulted in more deaths than history's major wars
