Conservation of desert wetlands and their biotas, Vol 1. For example, many species in the unique biotas of these regions share common Gondwana ancestors. The biotas of the Earth make up the biosphere. Ferns are prominent components of the biotas of the islands, especially in the tropical forest. The environment of the United States comprises diverse biotas, climates, and geologies. So far we have not exercised much imagination or ingenuity in rebuilding damaged biotas. The environment of China () comprises diverse biotas, climates, and geologies. It was associated with the international BIOTAS program, which also launched in 1986. Although each area is similar in ecological characteristics, their biotas were assembled differently.