1
How many liters of blood does a person usually have? On average, how many are taken in a blood donation?
It has between 4 to 6 liters. 450 milliliters are removed
It has 10 liters. 2 liters are removed
It has between 2 to 4 liters. 450 milliliters are removed
It has 7 liters. 1.5 liters are removed
2
Which is the smallest and largest country in the world?
San Marino and India
Monaco and Canada
Nauru and China
Vatican and Russia
3
60. What substance is absorbed by plants and exhaled by all living beings?
sodium nitrate
the oxygen
carbon dioxide
iron dioxide
nitrogen
4
16. How long does it take for sunlight to reach Earth?
8 minutes
seconds
12 hours
1 day
12 minutes
5
51. What are the chromosomes that determine the male sex?
The Zs
The Xs
The Y's
The V
The W
