A hypothetical Island lies far from any other landmasses. There are many different types of plants, but only one animal, a beetle plant and feed by chewing leaves. Given that the beetle is not exploiting all the resources on the island, which morphologic trigger an adaptive radiation of the beetles?

a mouthpart that can pierce fruits and seeds

Explanation:

An adaptive radiation is a process in which organisms diversify rapidly from an ancestral species into a multitude of new forms. That being said the most likely morphological change that would trigger this would be a mouthpart that can pierce fruits and seeds. This new change would allow the beetles to consume most of the different resources that the island has to offer such as the different types of plants and fruits which were previously inaccessible to the beetles.

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.