Final answer:
The author believes that the loss of plant species and habitats will devastate animals and hinder human progress.
Step-by-step explanation:
The author's beliefs about the disappearing species, as stated in the excerpt, are that the loss of plant species and habitats will devastate animals and hinder human progress. The author highlights the potential negative impacts of species extinction, such as the loss of scientific information, destruction of biological wealth, and the missed opportunities for discovering new medicines, crops, and other valuable resources.
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