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

75%

11%

437

Pakistan

72%

13%

Italy

64%

26%

Ukraine

63%

14%

12%

121

Belarus

63%

13%

14%

Brazil

15%

61%

11%

127

Republic of Ireland

10%

61%

26%

Belgium

61%

28%

India

14%

53%

14%

17%

297

the United Kingdom

10%

53%

27%

170

Kazakhstan

14%

53%

16%

Nigeria

52%

26%

19%

Australia

51%

39%

Poland

14%

48%

15%

22%

19124

the United States

11%

48%

10%

29%

200

the Netherlands

17%

46%

27%

101

Austria

46%

42%

Switzerland

41%

52%

Canada

21%

36%

34%

Germany

35%

47%

569

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?