![]() ![]() The difference between the composition of the Jurassic atmosphere and that of your own time may make it difficult for you to breathe when you first arrive, but your body will probably adapt to it before long. If you are author or own the copyright of this book, please report to us by using this DMCA report form. This document was uploaded by user and they confirmed that they have the permission to share it. ![]() ![]() This may account for the prolific plant life at the time, carbon dioxide being essential for the good growth of plants. Download Dougal Dixon - Man After Man.pdf. On the other hand the proportion of carbon dioxide was also high. Indeed this figure has been put forward to explain the survival of the very big dinosaurs, high oxygen concentrations in the breathing air being able to keep the great volumes of tissue oxygenated. In the late Jurassic it is possible that the oxygen levels were about 35%, as opposed to 20% at the present day. The oxygen levels became usable to us about 400 million years ago, but since then there has been a great variation in the oxygen levels. There are all sorts of physical factors as well. It explains clearly the evolutionary process is at work of this remarkable planet and man’s striking influence on its natural history. After Man is a beautifully illustrated account of the earths life and of its development. “It is not just the different plants and animals that define the environment. A Zoology of the Future Republished after forty years, After Man is the seminal work of speculative biology. ![]()
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