A necessary ingredient in the eggshell's suitability for gas exchange is its

As of 2009, there are 890 World Heritage Sites that are located in 148 countries (map). 689 of these sites are cultural and include places like the Sydney Opera House in Australia and the Historic Center of Vienna in Austria. 176 are natural and feature such locations as the U.S.’s Yellowstone and Grand Canyon National Parks. 25 of the World Heritage Sites are considered mixed i.e. natural and cultural Peru’s Machu Picchu is one of these. Italy has the highest number of World Heritage Sites with 44. India has 36 (28 cultural, 7 natural and 1 mixed) World Heritage Sites. The World Heritage Committee has divided the world’s countries into five geographic zones which include (1) Africa, (2) Arab States, (3) Asia Pacific (including Australia and Oceania), (4) Europe and North America and (5) Latin America and the Caribbean.
WORLD HERITAGE SITES IN DANGER
Like many natural, historic and cultural sites around the world, many World Heritage Sites are in danger of being destroyed or lost due to war, poaching, natural disasters like earthquakes, uncontrolled urbanization, heavy tourist traffic and environmental factors like air pollution and acid rain.

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I give the biggest credit of this honour to my movement’s Kaalu Kumar, Dhoom Das and Adarsh Kishore from India and Iqbal Masih from Pakistan who made the supreme sacrifice for protect ing the freedom and dignity of children. I humbly accept this award on behalf of all such martyrs, my fellow activists across the world and my countrymen. My journey from the great land of Lord Buddha, Guru Nanak and Mahatma Gandhi; India to Norway is a connect between the two centres of global peace and brotherhood, ancient and modern. Friends, the Nobel Committee has generously invited me to present a “lecture.” Respectfully, I am unable to do that. Because, I am representing here — the sound of silence. The cry of innocence. And, the face of invisibility. I represent millions of those children who are left behind and that’s why I have kept an empty chair here as a reminder. I have come here only to share the voices and dreams of our children– because they are all our children– (gesture to everyone in the audience). I have looked into their frightened and exhausted eyes. I have held their injured bodies and felt their broken spirits.

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Read the following extract and do the given activities :