Evolution Blog

Class blog for BIO E Evolution and Systematics

Sunday, November 26, 2006

Thinking Spot 1

This is for all of us who cannot access the IVLE yet:

Module 1 thinking spot:

Why is evolution measured in Geologic time?

Does evolution imply gradual changes?

classmates, you are entering an intellectual mine field!
prepare to be challenged...!


Blogger Carrie said...

Evolution is measured in geologic time maybe because of one of the evidences of evolution, the fossil, are embedded in layers of rocks. Different rock layers will be accounted for different geologic time and these different layers of rocks contain fossil remains of species. In the study of these fossils evolution can be noticed. One fossil found in one layer can be small and as you go to the next layers it becomes bigger and bigger. That is to say as you go from one geologic time to the next evolution can be noticed. To mark these evolutionary changes the best way is through geologic time or age of each layer of rocks where these fossils are found. Mostly evolution implies gradual change maybe because changes in living organisms are not as easy as in non-living thing. Non-living things can be altered abruptly without any detrimental result while in living organisms abrupt change can be detrimental. Living things have more complex structures and complex functions that need time to change, to adjust or to alter. Although there are fossil remains that imply abrupt changes. Well it can be true or not especially if your will take into consideration the scarcity of fossil remains that cannot fully show gradual evolution.

3:52 PM  
Blogger Riza said...

Evolution is measured in terms of geologic time because geologic time scale is one of the longest wise and supposedly represents the earth's natural history according to the evidences of evolution and the continued search about the history of earth and life. Scientist estimate earth was formed for 6 billion years ago. According to their calculations, the first living organisms appeared about 3 billion years ago and modern humans at about 2 million years ago. In this examples, like radioactive dating, fossil placement within rocks and even rings in the tree is used to place natural objects within geologic time scale. Yes! Evolution imply gradual changes because based from the meaning of evolution which is a process that results in heritable changes in a population spread over many generations. The surface of the earth has undergone many changes throughout history. Even today, changes continue to happen due to the volcanic eruptions, earthquakes, wind and rain.Living things also died out or have changed during a long period of the earth's existence.

4:39 PM  

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