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%
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0%
0%
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flagKenya
95%
5%
0%
0%
20
flagAustralia
84%
7%
5%
2%
38
flagGreece
81%
4%
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9%
22
flagPoland
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10%
6%
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flagGhana
71%
14%
7%
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14
flagGermany
70%
10%
9%
6%
284
flagCanada
70%
2%
12%
14%
41
flagthe United States
69%
8%
9%
9%
513
flagthe United Kingdom
68%
8%
9%
11%
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flagAustria
68%
10%
8%
10%
47
flagUnknown
68%
9%
13%
9%
22
flagthe Philippines
66%
13%
6%
13%
15
flagRepublic of Ireland
65%
6%
6%
15%
32
flagIndia
63%
8%
10%
15%
268
flagSwitzerland
62%
6%
13%
13%
29
flagSouth Africa
59%
18%
9%
9%
22
flagFrance
53%
20%
20%
0%
15
flagNigeria
47%
5%
11%
35%
17
flagPakistan
45%
20%
25%
10%
20