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

Brazil

83%

Russia

73%

13%

125

Pakistan

72%

12%

Republic of Ireland

10%

65%

20%

Ukraine

63%

14%

Austria

60%

12%

27%

Nigeria

57%

21%

15%

Australia

55%

35%

Belarus

55%

18%

the United Kingdom

11%

53%

27%

108

Greece

28%

52%

India

14%

51%

15%

17%

208

Kazakhstan

11%

47%

11%

29%

Poland

14%

46%

15%

22%

17136

the Philippines

16%

44%

22%

16%

the Netherlands

19%

41%

35%

Germany

10%

39%

41%

196

the United States

14%

39%

11%

32%

Switzerland

37%

56%

Italy

12%

32%

48%

How do baby birds get oxygen inside their eggs?

They have a large oxygen supply from the start

Oxygen is created during protein reduction

Oxygen comes in through pores in the shell

They don't need oxygen at all

Which dogs are known to eat fish?

Okavango river is famous for its biologically rich delta. What is the river's outlet?

Guinea Bay

Indian Ocean

Red Sea

It doesn't have an outlet to the sea

What country does the equator pass through?