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Which non-coniferous trees are the tallest in the world?

oaks

populus

baobabs

eucalypts

Eucalyptus regnans, the Australian mountain ash, is the tallest of all flowering plants. Today, the tallest measured specimen named Centurion is 99.6 m (327 ft) tall (taller than the highest giant sequoia). Six other eucalypt species exceed 80 metres in height.

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Estonia

0%

7%

0%

92%

13

Australia

10%

10%

2%

76%

39

Republic of Ireland

5%

11%

17%

64%

17

Belarus

7%

3%

28%

60%

28

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6%

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54%

31

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18%

9%

15%

53%

278

Ukraine

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5%

32%

53%

188

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36%

52%

112

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13%

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26%

46%

30

Germany

9%

16%

27%

45%

587

the United States

14%

16%

21%

45%

406

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0%

10%

45%

45%

20

the United Kingdom

6%

19%

30%

43%

160

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18%

37%

43%

16

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7%

20%

29%

41%

154

Poland

5%

17%

38%

38%

11642

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7%

23%

30%

38%

13

Canada

12%

30%

23%

33%

39

the Philippines

26%

15%

26%

31%

19

Switzerland

6%

32%

32%

28%

49

How deep is the root system of a giant sequoia?

4 meters (13 feet)

20 meters (60 feet)

40 meters (130 feet)

80 meters (260 feet)

This kind of tilted forest is a common sight in subarctic taiga. What is this phenomenon caused by?

low sun position

What is the largest tree-dwelling animal?

At what altitude do airliners fly on long-distance flights?

approx 10,000 ft

approx 20,000 ft

approx 35,000 ft

approx 50,000 ft