I know what I'm eating. Fruits

Vladik spends his holidays at his grandmother's dacha, and one day she treats him to an unusual fruit - a delicious mango. A seed is found inside, and Vladik decides to plant it. He wants to grow his own mango tree so much that he decides to learn everything about the fruit. Why does grandma grow apples and currants, but not bananas and pineapples? Why were exotic fruits once rare, but now they are available all year round? What animals eat almost exclusively fruits and can humans do the same? And finally, why should fruits be in every person’s diet? For children from 3 years old.