What is the main purpose for baobab to have such thick trunk?

water storage
fire resistance
heat resistance
protection against elephants
The swollen trunk of the baobab tree can store as much as 31,700 gallons (120,000 l) of water to endure harsh drought conditions. Indigenous Australians used baobabs as a source of water.
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Very interesting!
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Answers by country

water storage
fire resistance
heat resistance
protection against elephants
answers
flagNew Zealand
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flagKenya
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flagIraq
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flagAustralia
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flagGermany
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flagPoland
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flagRwanda
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flagRepublic of Ireland
70%
11%
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flagAustria
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flagthe United States
69%
9%
9%
8%
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flagthe United Kingdom
69%
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9%
11%
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flagGreece
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15%
13
flagthe Philippines
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7%
15%
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flagUnknown
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9%
13%
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flagCanada
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flagSwitzerland
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13%
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flagIndia
64%
8%
9%
14%
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flagSouth Korea
60%
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10
flagPakistan
46%
13%
26%
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15
flagSouth Africa
38%
30%
15%
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13