10 days
30 days
60 days
90 days
120 days
Correct answer is E
Red blood cells have an average lifespan of about 120 days.
Which ancient wonder was located in modern-day Iraq?...
Which event is known as "The Shot Heard Round the World"?...
What is the official language of Greenland?...
What is the longest-running animated TV show?...
Which tree produces the fruit known as the "fig"?...
What is the most common symptom of a common cold?...
Who was the first President of the Soviet Union?...