Latitudinal gradients

Scientists discover a new planet that is very similar to Earth. They find that equatorial regions are very species rich, but polar regions have much less diversity in species. The scientists then study the history of climate and environmental changes across the planet. They conclude that there is evidence that speciation on that planet is a function of time.

Which of the following observations could the scientists have made to support this theory?

(Choice A)
The equatorial regions underwent frequent changes, while the polar regions remained relatively constant.
(Choice B)
The polar regions underwent frequent changes, while the equatorial regions remained relatively constant.
(Choice C)
Both polar and equatorial regions underwent frequent changes over time.

Class 12 Biology (India)

Course: Class 12 Biology (India) > Unit 14

Problem