How small are red blood cells?
A.) 10^-3 m.
B.) 10^-4 m.
C.) 10^-5 m.
D.) 10^-6 m.
E.) 10^-7 m.
Ans: C.) 10^-5 m.
Physics & Space Science
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a. contains about 100 billion stars. b. is about 200 light-years in diameter. c. is the largest known object in the universe. d. all of the above e. a and c
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Refer to the figure above. Today's carbon dioxide concentration is about ________ that at any other time in the past 800,000 years.
A) 2 % higher than B) 45% higher than C) double D) 400 times
Physics & Space Science
An old bone sample contains 321. grams of carbon and its activity is 947. decays/min. (5730. yr half life of Carbon-14)
(a) How many thousand years old is the sample? (b) What will be the activity of the sample 2000. yrs from now?
Physics & Space Science