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

76%

11%

425

Pakistan

72%

13%

Ukraine

64%

12%

117

Brazil

13%

64%

11%

116

Italy

64%

26%

Belarus

63%

13%

15%

Republic of Ireland

10%

61%

26%

Belgium

60%

29%

Kazakhstan

15%

54%

12%

India

14%

53%

14%

17%

295

the United Kingdom

10%

52%

27%

161

Australia

52%

38%

Nigeria

52%

26%

19%

Poland

14%

48%

15%

22%

18986

Austria

46%

42%

the United States

11%

45%

11%

30%

177

the Netherlands

19%

43%

28%

Switzerland

40%

53%

Germany

36%

47%

543

Canada

21%

36%

34%

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?