Why did the appearance of angiosperms contribute to the flourishing of insects?

1) double fertilization, providing the embryo with reserves of nutrients and protecting it by the pericarp ensured biological progress for flowering plants: angiosperms spread widely and adapted to seasonal climate changes;
2) the amount and variety of plant foods increased, which contributed to the flourishing of insects;
3) insects, in turn, contributed to the cross-pollination of flowering plants and their dispersal.

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