What will happen in the mixed forest biocenosis if all species of insects disappear from it?

1) Insectivorous birds will be left without food.
2) The number of insectivores and then birds of prey will sharply decrease.
3) The fertility of insect pollinated plants will drop sharply.
4) The food chain in the row of producers – consumers of the 2nd – 3rd orders will be broken.

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