Over one half of the world's species live in tropical rain forests. It is estimated that fewer than 1.4 million of the world's species have been named. Most of the unidentified species live in the tropics. As we begin to explore these habitats, surprising discoveries are made. Scientists believe the deep sea floor could contain as many as a million undescribed species.
Species evolve to fill particular niches or habitats that exist on Earth.
Many species depend on each other in intricate ways for survival. Destroying one species can lead to further extinctions or changes. True or False . We don't know. Scientists are often delighted to find a cure for a dreaded human disease in a lowly mite.