When the Invasion of Land Failed: The Legacy of the Devonian Extinctions [EPUB]

When the Invasion of Land Failed: The Legacy of the Devonian Extinctions [EPUB]
When the Invasion of Land Failed: The Legacy of the Devonian Extinctions by George R. McGhee Jr
2013 | EPUB | 26.13MB

The invasion of land by ocean-dwelling plants and animals was one of the most revolutionary events in the evolution of life on Earth, yet the animal invasion almost failed -- twice -- because of the twin mass extinctions of the Late Devonian Epoch. Some 359 to 375 million years ago, these catastrophic events dealt our ancestors a blow that almost drove them back into the sea. If those extinctions had been just a bit more severe, spiders and insects might have become the ecologically dominant forms of animal life on land. This book examines the profound evolutionary consequences of the Late Devonian extinctions, which shaped the composition of the modern terrestrial ecosystem. Only one group of four-limbed vertebrates now live on Earth while other tetrapod-like fishes are extinct. This gap is why the idea of "fish with feet" seems so peculiar yet these animals were once a vital part of our world.

Just Enough Physics [EPUB]

Just Enough Physics [EPUB]
Just Enough Physics by Rhett Allain, Khandan Simmons
2011 | EPUB | 5.52MB

Do you need help with your physics course? Maybe you just want to go over some of the concepts from that intro class you took some time ago. Well, then maybe this book is for you.

What is this? Is it a textbook? Maybe. It isn't a traditional textbook, that is for sure. There are no homework questions and it is written in a much more informal style.

This book goes over basic physics that you would find in the first semester of a college-level or high school physics course.

Tales of the Ex-Apes: How We Think about Human Evolution [EPUB]

Tales of the Ex-Apes: How We Think about Human Evolution [EPUB]
Tales of the Ex-Apes: How We Think about Human Evolution by Jonathan Marks
2015 | EPUB + PDF | 1.63/1.14MB

What do we think about when we think about human evolution? With his characteristic wit and wisdom, anthropologist Jonathan Marks explores our scientific narrative of human origins—the study of evolution—and examines its cultural elements and theoretical foundations. In the process, he situates human evolution within a general anthropological framework and presents it as a special case of kinship and mythology.

Tales of the Ex-Apes argues that human evolution has incorporated the emergence of social relations and cultural histories that are unprecedented in the apes and thus cannot be reduced to purely biological properties and processes. Marks shows that human evolution has involved the transformation from biological to biocultural evolution. Over tens of thousands of years, new social roles—notably spouse, father, in-laws, and grandparents—have co-evolved with new technologies and symbolic meanings to produce the human species, in the absence of significant biological evolution. We are biocultural creatures, Marks argues, fully comprehensible by recourse to neither our real ape ancestry nor our imaginary cultureless biology.

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