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

Russia

73%

13%

256

Pakistan

73%

13%

Brazil

12%

68%

11%

Ukraine

64%

11%

13%

103

Republic of Ireland

64%

25%

Belarus

58%

14%

17%

Nigeria

56%

18%

21%

Belgium

56%

26%

India

13%

54%

13%

17%

274

the United Kingdom

52%

30%

136

Australia

52%

40%

Kazakhstan

17%

51%

20%

Austria

50%

39%

Poland

14%

47%

15%

22%

18109

the Netherlands

15%

47%

30%

the United States

11%

42%

13%

31%

127

Germany

36%

10%

45%

395

Canada

17%

35%

10%

35%

Switzerland

32%

64%

Italy

10%

27%

51%

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?