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%
77%
4%
11%
400
flagPakistan
6%
72%
6%
13%
61
flagBrazil
13%
65%
11%
7%
114
flagItaly
4%
64%
2%
26%
67
flagUkraine
9%
63%
12%
12%
111
flagBelarus
8%
63%
14%
14%
57
flagRepublic of Ireland
10%
62%
2%
25%
48
flagBelgium
5%
58%
5%
30%
39
flagKazakhstan
14%
55%
10%
13%
69
flagIndia
14%
53%
13%
17%
293
flagthe United Kingdom
10%
52%
8%
28%
160
flagNigeria
2%
52%
26%
19%
42
flagAustralia
4%
52%
4%
38%
42
flagPoland
14%
48%
15%
22%
18844
flagAustria
2%
45%
8%
43%
90
flagthe United States
12%
44%
11%
30%
165
flagthe Netherlands
19%
44%
6%
29%
89
flagSwitzerland
4%
40%
2%
52%
44
flagCanada
21%
36%
7%
34%
38
flagGermany
6%
34%
10%
48%
517