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
100%
0%
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flagKenya
92%
7%
0%
0%
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flagIraq
90%
9%
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flagAustralia
87%
6%
6%
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flagSwitzerland
81%
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9%
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flagGreece
80%
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20%
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flagPoland
72%
9%
11%
6%
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flagGermany
72%
10%
10%
4%
48
flagRwanda
72%
9%
18%
0%
11
flagthe United Kingdom
70%
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8%
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104
flagthe United States
69%
10%
10%
8%
408
flagthe Philippines
69%
7%
7%
15%
13
flagUnknown
68%
9%
13%
9%
22
flagRepublic of Ireland
68%
12%
0%
12%
16
flagCanada
66%
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14%
18%
27
flagIndia
63%
7%
10%
15%
208
flagSouth Korea
60%
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20%
10
flagPakistan
53%
7%
23%
15%
13
flagSouth Africa
50%
30%
10%
10%
10