Why do you think that some definitions of forest have a certain percentage of the land that must be covered in trees?

30 percent tree cover - 2000 - 2009JPEG ... of forest cover vary widely—as much as 6 percent of Earth's land area, or the equivalent area of China.

Explanation:

More than one million bones were recovered in 1906. These bones represented 231 species of vertebrates and there were 234 species of invertebrates.

Los Angeles climate is relatively stable for over 50,000 years. The fossils of more than 180 insects were preserved in La Brea Tar Pits. The climate warming probes a link for evolution of Ice Age predators.

Learn more at