What have scientists concluded about the levels of plant and animal biodiversity on easter island

The scientists have concluded that the Easter Island had very high level of biodiversity prior to the arrival of humans on it. The island offered mild climate, deep and fertile soil, and that resulted in the formation of sub-tropical rainforest, with enormous amount of species living in it despite its small size. This statement has been proved by the examination of pollen, bones, and other fossilized remains on the island. Unfortunately, the human inhabitants destroyed almost all living things on the island, resulting in the barren landscape that we see nowadays, with only short grasses, the occasional shrub, and several species of insects occupying the island.

chemicals, posion.

are some basics