The fossil record reveals that the diversity of flowering plants and the diversity of certain insect groups increased at the same time. How might you explain this?

Insects and flowers are connected with each other for several life purposes such as for food, habitat and pollination.

The cause of diversity in flower and insects is associated with the process of pollination. In the process of pollination, both insects and flowers are mutually get benefits.

Insects move flower to flower in search of food and in the process it also carry pollen from flower to flower as well. Through insects the pollen reaches to different flower and show diversity and at the same time insects feed on various types of flowers and reproduce generation with variations.

Hence, the process of pollination makes a relationship between flower and insects diversity at the same time.

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.