Some features might be feathers, thin bones, they are lighter to make flying easier.
I'm pretty certain that the earth's circumference is greatest at the equator.
The answer is D. A genetic mutation led to punctuated equilibrium
Answer:
Rain
Explanation: Rain can wet the mud, and cause it to slide. This is one cause of a landslide that humans don't cause. This is why rain is a natural cause for lanslides.
