All living organisms are connected between each other because they have shared ancestor. I suggest you to read some stuff about evolution to make it more clear to understand.
Barry should wear warm clothing during cold
weather. He should also include meals and fruits with the required vitamins
such as vitamin C in his diet to boost immunity and also exercise regularly to
improve his overall health. Besides he may take vitamin c boosters. Lastly,
avoid congested areas.
Answer:
the presence of hollow bones
Explanation:
hollow hollow bones are one of the adaptive features in birds which enables them to fly.
