Final answer:
In the last two million years, Earth has witnessed cooler climates which have led to the development of glaciers during various ice ages, affecting global habitats and causing sea levels to fall. The answer to the question is c) Glaciers.
Step-by-step explanation:
The climates of the past two million years have generally been cooler than in the previous epochs, marked by the recurrent development of glaciers. Throughout this time, known as the Pleistocene Epoch, the planet has experienced several ice ages, where global temperatures dropped significantly.
This led to large ice sheets covering much of the Northern Hemisphere, which caused sea levels to fall and created land bridges between continents. These changes affected various ecosystems, even closer to the equator where drying occurred, transforming some habitats.
But the most prominent feature of these cooler climates has been the expansion of ice, leading to extensive glaciation periods and the formation of massive ice sheets and glaciers. The last ice age ended about 10,000 years ago, transitioning Earth into the current warmer inter-glacial period. The answer to the question is c) Glaciers.