Which of the following is the smallest?

bacteria
viruses
White blood cells
protozoa
Viruses are by far the smallest, their whole "body" is a DNA or RNA code packed in a protein coat. Unlike the rest of the given, they are not living cells.
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Answers by country

bacteria
viruses
White blood cells
protozoa
answers
flagBrazil
7%
78%
0%
14%
14
flagRussia
6%
75%
5%
12%
104
flagPakistan
6%
75%
4%
13%
45
flagUkraine
8%
64%
10%
12%
57
flagRepublic of Ireland
11%
61%
5%
22%
18
flagAustria
0%
57%
14%
28%
28
flagthe United Kingdom
10%
55%
8%
25%
94
flagAustralia
6%
53%
3%
36%
30
flagGreece
28%
52%
9%
9%
21
flagIndia
15%
51%
14%
18%
185
flagBelarus
9%
50%
18%
22%
22
flagthe Philippines
18%
50%
12%
18%
16
flagBelgium
16%
50%
8%
25%
12
flagPoland
14%
46%
15%
22%
16914
flagKazakhstan
12%
43%
12%
31%
16
flagthe United States
14%
40%
7%
35%
82
flagSwitzerland
6%
40%
0%
53%
15
flagGermany
12%
38%
9%
39%
163
flagthe Netherlands
23%
34%
3%
38%
26
flagItaly
8%
34%
4%
47%
23