In this question, there are no options given to choose from. So i would answer this question based on my knowledge. The most likely cause of the observed variation is adaptation and evolution. The birds of that island adapted to the food source and then they evolved as per the requirement of the place and food source.
The unit of measurement in an ecological footprint is the global hectare.
It is a polar molecule I'm pretty sure. And hinataaaa
A mass movement that involves the sudden movement of a block of material along a flat, inclined surface is called a SLIDE.