Short essay on life on earth

Short essay on life on earth University, where he has been on the faculty since 1967. Antioch College and a PhD.

Some creators announce their inventions with grand ├ęclat. Ediacaran, which appeared some 600 million years ago. Cambrian explosion of modern life. Darwinian focus on organisms and their struggles for reproductive success.

Pikaia, has been found among these earliest fossils. Burgess Shale, our best preserved Cambrian fauna. But the additions are rare and episodic. Eryops, a dinosaur, a mammal and a human being. Ediacaran fauna is now a subject of intense discussion. Cambrian explosion within five million years. CLASSICAL REPRESENTATIONS OF LIFE’S HISTORY reveal the severe biases of viewing evolution as embodying a central principle of progress and complexification.

In these paintings by Charles R. Knight from a 1942 issue of National Geographic, the first panel shows invertebrates of the Burgess Shale. Tertiary boundary 65 million years ago. Mass extinctions are not random in their impact on life. Darwinian struggles of normal times. Cretaceous event and that mammals therefore rule the vertebrate world today.

New icons might break the locks. EXTINCTION: A SCIENTIFIC AMERICAN BOOK. WONDERFUL LIFE: THE BURGESS SHALE AND THE NATURE OF HISTORY. Edited by Stephen Jay Gould. Please forward this error screen to 69.

Please forward this error screen to 209. Environmental pollution is the biggest menace to the human race on this planet today. It means adding impurity to environment. The environment consists of earth, water, air, plants and animals. If we pollute them, then the existence of man and nature will be hampered. It is true that trees are being cut down rapidly.

Our earth is becoming warmer. If pollution continues, the day is not far when our earth will be a boiling pan and become a desert. Or it will be covered with sea water causing destruction of mankind. Pure air is always needed for inhaling. If we take pure air, our health improves.

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