What is a trigger for opening a sequoia cone?

frost
fire
flood
earthquake
Young sequoias are able to grow suc­cess­ful­ly only in mineral soils in full sun­light, free from com­pet­ing veg­e­ta­tion. They there­fore require periodic wildfire to clear the area. Due to very thick bark, the fire doesn't harm sequoia.

Answers distribution

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flagthe United Arab Emirates
4%
68%
4%
24%
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flagItaly
25%
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flagGermany
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flagNorway
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flagFrance
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flagthe United Kingdom
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flagthe Netherlands
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flagRepublic of Ireland
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flagPoland
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flagCzech Republic
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flagthe United States
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flagPakistan
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Gender

men57%
women55%
frost
21%
20%
fire
57%
55%
flood
9%
10%
earthquake
10%
13%

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What is a trigger for opening a sequoia cone?
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