Evolution For Dummies by Greg Krukonis

By Greg Krukonis

This present day, most schools and universities provide evolutionary examine as a part of their biology curriculums. Evolution For Dummies will song a category during which evolution is taught and provides an goal clinical view of the topic. This balanced consultant explores the background and way forward for evolution, explaining the ideas and technology in the back of it, delivering case stories that help it, and evaluating evolution with rival theories of production, equivalent to clever layout. It will also determine the indicators of evolution on this planet round us and clarify how this conception impacts our daily lives and the longer term to return.

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By knowing the actual age of the Earth and how long life has been present, scientists can ask whether enough time has passed for simple creatures such as the ones they see in the oldest rocks to evolve into more complex creatures, such as the ones that can write and edit books. The quick answer: Yes. The fossil record Fossils are the preserved remains of the bodies of dead organisms or the remains of the organism’s actions — things such as footprints or burrows. The total of all fossils is called the fossil record.

Qxp 14 2/19/08 5:56 PM Page 14 Part I: What Evolution Is companion to the captain of the HMS Beagle, a ship bound for South America with the purpose of mapping the area and sending plant, animal, and fossil specimens back to England. The voyage lasted five years, from 1831 to 1836. Several things led Darwin to speculate about the changes that might occur in species over time: the diversity of life he observed on his voyage, the geographical patterns whereby different yet obviously related species were found in close proximity to one another, and the fossils he collected that made it clear present-day species weren’t the ones that had been present in the past.

Speciation Darwin realized that because individuals differ in the characters they have, and because these differences affect their chances of survival and reproduction, some characters are more likely to get into the next generation than others. He also realized that as a result of this process, the frequency of characters changes over generations. Pass through enough generations, and the sum of all the little evolutionary changes may result in an organism that’s evolved into an entirely different species.

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