Biology: A Guide to the Natural World (5th Edition) by David Krogh

By David Krogh

<P style="MARGIN: 0px">David Krogh’s Biology: A advisor to the ordinary World leads readers on a memorable trip during the global of biology, utilizing appropriate examples, clearly-developed illustrations, and useful insights that resonate with today’s students. 
<P style="MARGIN: 0px"> 
<P style="MARGIN: 0px">Widely-recognized as a e-book that scholars take pleasure in examining, the 5th variation  has been completely up to date with new discussions on social matters and health and wellbeing purposes, besides streamlined bankruptcy summaries and accelerated assessment questions.

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Extra resources for Biology: A Guide to the Natural World (5th Edition)

Sample text

Then follows the question, which broadly speaking is one of three types: a what question, a why question, or a how question. Biologists have asked, for example: What are genes made of? Why does the number of species decrease as we move from the equator to the poles? How does the brain make sense of visual images? Following the formulation of the question, various hypotheses are proposed that might answer it. A hypothesis is a tentative, testable explanation for an observed phenomenon. In almost any scienti c question, several hypotheses are proposed to account for the same observation.

Several organs and related tissues then can be integrated into an organ system. The sea lion s brain, its spinal cord, and all the nerves that extend from these organs constitute the sea lion s nervous system. An assemblage of cells, tissues, organs, and organ systems can then form a multicelled organism such as the sea lion. ) From this point out, life s levels of organization all involve many organisms living together. Members of a single type of living thing (a species), living together in a de ned area, make up what is known as a population.

One reason for this difference is that the component parts of physics are uniform and far fewer than is the case in biology. Physics deals with only 92 stable elements, such as hydrogen and gold, and to a rst approximation, if you ve seen one electron, you ve seen them all. Meanwhile, in biology, if you ve seen one species, you ve seen just that one species. Each species is at least marginally different from another, and many are greatly dissimilar. Moreover, each species has all the organizational levels of elements in physics and more.

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