Answer:
Muscles can also receive messages from the brain when the body temperature decreases. They respond by shivering. Shivering causes the muscles to contract and relax quickly. This process generates heat.
Fats, oil and cholesterol are all types of lipids. This statement is absolutely true. Lipids are considered as fatty acids. And fats are types of fatty acid as well as the cholesterol and oil. Usually lipids are found on any food that has oils.
One reason is that the two kinds of birds live in two different types of environments and also the sharp billed ground finch does not just it plant matter. It feast on the blood of bigger sea birds. This is an adaptation that it has so it does not have to eat plant matter and compete for food