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
4%
83%
4%
8%
24
flagRussia
6%
73%
6%
13%
125
flagPakistan
6%
72%
6%
12%
48
flagRepublic of Ireland
10%
65%
5%
20%
20
flagUkraine
8%
63%
9%
14%
61
flagAustria
0%
60%
12%
27%
33
flagNigeria
5%
57%
21%
15%
19
flagAustralia
5%
55%
2%
35%
34
flagBelarus
7%
55%
18%
18%
27
flagthe United Kingdom
11%
53%
7%
27%
108
flagGreece
28%
52%
9%
9%
21
flagIndia
14%
51%
15%
17%
208
flagKazakhstan
11%
47%
11%
29%
17
flagPoland
14%
46%
15%
22%
17136
flagthe Philippines
16%
44%
22%
16%
18
flagthe Netherlands
19%
41%
3%
35%
31
flagGermany
10%
39%
8%
41%
196
flagthe United States
14%
39%
11%
32%
96
flagSwitzerland
6%
37%
0%
56%
16
flagItaly
12%
32%
4%
48%
25