Cold air is correct answer
The answer is mineral deposits
Well they can fly duhh. But there are other things as well they are very good hunters believe it or not birds have to use certain techniques to catch and find worms and other foods like the eagle as big as an eagle is the fact that it can make a top notch stealth approach on any of its prey is amazing. The way birds learn to fly is crazy but fascinating while birds are babies the parent pushes them off a high tree branch and wait till they get to a certain point if they don't fly they swoop down and catch them and do it again. This is to build the instinct within the baby bird to flap their wings. Now... When the bird gets to a certain age they should know how to fly unless they've broken a wing from all the times of falling from 80 foot trees or higher. But anyway the parent pushes them off for the last time and if they fly they go away and stay away forever but if they don't the parent must let them fall to the ground because at that point the bird won't survive in case of a predator attack.
Earths history of climate is easily understandable through the study of existing rock and shells aquatic organisms. Rocks came into the earth million of years ago. So, the study of age determinism of rock gives an idea of climate through which it has come across. This is called paleontology.
Explanation:
In studying Earth's history of climate scientists take help of available rocks and body parts of aquatic animals. As rocks are the most eventful findings on the earth's surface which has come across million of years and witnessed several changes. These study if changes in rock is called paleontology.
Shells of aquatic animal which found in underwater are also a good evidence of earth's history of climate. It is found in the layers of sedimentary rock which is soft in nature and found in layerwise. Where all the organism became fossil after death and its body parts remains in the form of stone.
