Essentials of the Living World , Second Edition by George B. Johnson

By George B. Johnson

During this uncomplicated recommendations model of our very winning The dwelling international, George Johnson has supplied the basics to knowing biology in a extra condensed structure whereas nonetheless integrating analogies and present concerns which makes technology proper to the scholar. George Johnson’s textbook has frequently been thought of a scholar favourite. Dr. Johnson has written this non-majors textbook from the floor as much as be an interesting and available studying device with an emphasis on "how issues paintings and why issues occur the way in which they do". This authoritative textbook incorporates a elementary, transparent writing kind and a wide selection of media resources to augment the content material of the textbook. The power of this textbook is the combination of many instruments which are designed to motivate either scholars and teachers. The multi-media package deal for the textual content stretches scholars past the confines of the normal textbook to incorporate excessive curiosity videos and animations of key organic techniques.

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Sample text

1. Population. The most basic of these is the population, which is a group of organisms of the same species living in the same place. A flock of geese living together on a pond is a population. POPULATIONAL LEVEL 2. Species. All the populations of a particular kind of organism together form a species, its members similar in appearance and able to interbreed. All Canada geese, whether found in Canada, Minnesota, or Missouri, are basically the same, members of the species Branta canadensis. 3. Community.

The weight of swimming animals is fully supported by the surrounding water, and no effort goes into supporting the body, while running and flying animals must support the full weight of their bodies. On the other hand, water presents considerable resistance to movement, air much less, so that flying and running require less energy to push the medium out of the way. A simple way to compare the costs of moving for different animals is to determine how much energy it takes to move. The energy cost to run, fly, or swim is in each case the energy required to move one unit of body mass over one unit of distance with that mode of locomotion.

Scores are often different when social and racial groups are compared. Q. scores of poor children measure lower as a group than do scores of children of middle-class and wealthy families? This difference has led to the controversial suggestion by some that bizarre reasons claimed by their promoters, but simply the poor are genetically inferior. because they are low-calorie diets. What should we make of such a harsh In teaching my students at Washington University conclusion? Q. have all 1. All calories are equal.

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