The structure of the skin is an effective barrier against bacteria. The multiple layers of epidermis, while can be invaded by foreign organisms, has a high turnover rate which means it is constantly shedding, therefore even the bacteria is shed protecting the body. Lastly, the skin's lipids maintain an acidic pH which slows and stops growth and replication of bacteria.
That body parts are called "Homologous Organs" which are similar in origin & structure.
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Answer: D. It increases the bird's chances of finding a mate.
Explanation:
As the question states, it's beautiful for the mate to see.
It's empty or fairly large, making the sounds from your hands bounce of the walls and therefore having it echo
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When populations have differences in rituals or behaviors. When populations are separated by rivers, mountains, r bodies of water.
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