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
7%
73%
5%
13%
256
flagPakistan
5%
73%
5%
13%
52
flagBrazil
12%
68%
11%
7%
63
flagUkraine
8%
64%
11%
13%
103
flagRepublic of Ireland
7%
64%
2%
25%
39
flagBelarus
9%
58%
14%
17%
41
flagNigeria
3%
56%
18%
21%
32
flagBelgium
8%
56%
8%
26%
23
flagIndia
13%
54%
13%
17%
274
flagthe United Kingdom
9%
52%
8%
30%
136
flagAustralia
5%
52%
2%
40%
40
flagKazakhstan
17%
51%
8%
20%
35
flagAustria
1%
50%
9%
39%
66
flagPoland
14%
47%
15%
22%
18109
flagthe Netherlands
15%
47%
6%
30%
59
flagthe United States
11%
42%
13%
31%
127
flagGermany
7%
36%
10%
45%
395
flagCanada
17%
35%
10%
35%
28
flagSwitzerland
4%
32%
0%
64%
25
flagItaly
10%
27%
6%
51%
29