generate questions: Following the Cretaceous–Paleogene extinction event, the extinction of the dinosaurs and the wetter climate may have allowed the tropical rainforest to spread out across the continent. From 66–34 Mya, the rainforest extended as far south as 45°. Climate fluctuations during the last 34 million years have allowed savanna regions to expand into the tropics. During the Oligocene, for example, the rainforest spanned a relatively narrow band. It expanded again during the Middle Miocene, then retracted to a mostly inland formation at the last glacial maximum. However, the rainforest still managed to thrive during these glacial periods, allowing for the survival and evolution of a broad diversity of species.
Which type of climate may have allowed the rainforest to spread across the continent? {sep_token} What has allowed for the Savanna region to expand into the tropics? {sep_token} During what time did the rainforest spanned a narrow band? {sep_token} When did it retract to a inland formation? {sep_token} Did the rainforest managed to thrive during the glacial periods? {sep_token} What may have caused rainforests to grow across South America? {sep_token} How many degrees south did the Amazon rainforest reach from 66-34 Mya? {sep_token} What has caused savanna regions to grow into the South American tropics in the last 34 million years? {sep_token} During which period in history was the Amazon rainforest a narrow band of forest? {sep_token} What did the Amazon rainforest do during the Middle Miocene? {sep_token} What extinction event might have created some conditions allowing the expansion of the amazon rainforest? {sep_token} Beginning how many years ago did the amazon rainforest extend 45 degrees south? {sep_token} After the Oligocene period, under what period did the amazon rainforest begin to expand? {sep_token} The amazon rainforest became a mostly inland forest around which global event? {sep_token} Savannah areas expanded over the last how many years? {sep_token}