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
flagRussia
5%
76%
4%
11%
419
flagPakistan
6%
72%
6%
13%
61
flagBrazil
13%
64%
11%
7%
116
flagItaly
4%
64%
2%
26%
67
flagUkraine
8%
63%
13%
13%
114
flagBelarus
8%
63%
14%
14%
57
flagRepublic of Ireland
10%
61%
2%
26%
49
flagBelgium
4%
60%
4%
29%
41
flagKazakhstan
15%
54%
10%
12%
70
flagIndia
14%
53%
14%
17%
295
flagthe United Kingdom
10%
52%
8%
27%
161
flagNigeria
2%
52%
26%
19%
42
flagAustralia
4%
52%
4%
38%
42
flagPoland
14%
48%
15%
22%
18925
flagAustria
2%
47%
8%
41%
93
flagthe United States
12%
45%
10%
30%
173
flagthe Netherlands
19%
43%
8%
28%
92
flagSwitzerland
4%
41%
2%
52%
46
flagCanada
21%
36%
7%
34%
38
flagGermany
6%
35%
9%
47%
533