Which mammals tolerate exceptionally high levels of carbon dioxide?

rats

horses

moles

bats

Moles are adapted to survive in low-oxygen environments such as underground burrows. They tolerate higher levels of carbon dioxide than other mammals because their blood cells contain a special form of hemoglobin.

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Answers by country

Estonia

78%

10%

Australia

14%

70%

the United States

17%

63%

11%

154

Colombia

16%

22%

50%

11%

Poland

30%

47%

16%

2565

the United Kingdom

26%

44%

21%

Italy

23%

43%

26%

229

India

11%

24%

42%

18%

105

the Netherlands

37%

33%

25%

Spain

40%

32%

21%

France

31%

14%

31%

19%

Kazakhstan

20%

12%

29%

33%

Belarus

25%

28%

39%

Brazil

36%

26%

27%

Russia

36%

25%

31%

122

Uruguay

48%

14%

25%

11%

Ukraine

41%

24%

20%

Germany

41%

11%

21%

24%

379

Austria

46%

12%

16%

24%

Switzerland

38%

14%

29%

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?

Where is it NOT possible to find a penguin?

in Iceland

in Africa

on Galapagos Islands (near equator)

in South America

Do moles eat plant roots?

Yes, but only during spring

Yes, but only young moles

Yes, often