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%

67%

10%

the United States

16%

64%

11%

170

Poland

30%

47%

16%

2624

the United Kingdom

25%

47%

19%

107

Colombia

21%

47%

10%

Italy

21%

46%

24%

247

India

12%

25%

42%

17%

107

the Netherlands

34%

37%

24%

Spain

41%

32%

20%

France

34%

13%

29%

20%

Belarus

25%

28%

39%

Kazakhstan

24%

12%

28%

32%

Brazil

36%

26%

27%

Russia

36%

25%

31%

122

Uruguay

48%

14%

25%

11%

Ukraine

41%

24%

20%

Germany

40%

11%

23%

409

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