Vegetation depends mainly on climate, and animals depend on the amount of food they eat. The shrinking of habitats and the loss of their carrying capacity […]
During the ice age, environmental changes caused by glaciations and warmings, followed by further cooling, led to regular cycles of change in vegetation in a given […]
The ice spread from the poles towards the equator. In the high mountains, the boundary of perpetual snow has moved lower. Vast body of seawater froze […]