These images from the Smithsonian Institution depict Nancy Knowlton's work with snapping …
These images from the Smithsonian Institution depict Nancy Knowlton's work with snapping shrimp in Panama. Knowlton found that the closing of the isthmus -- dividing the Pacific Ocean from the Caribbean -- resulted in new species of shrimp.
This annotated slideshow adapted from KET's Electronic Field Trip to the Forest …
This annotated slideshow adapted from KET's Electronic Field Trip to the Forest illustrates how blight decimated the American chestnut tree and the methods scientists use to identify and pollinate the remaining trees to create blight-resistant trees.
Get the facts about the Arctic Fox. Besides finding a physical description …
Get the facts about the Arctic Fox. Besides finding a physical description of Canada's smallest fox, you'll also learn about some of its unique facts and characteristics. Also included in this Mammal Fact Sheet on the Arctic Fox is information on its habitat and habits, range, feeding, breeding, and conservation efforts. A list of resources completes the fact sheet.
Read about the endangered Asian Elephant. Find out what it likes to …
Read about the endangered Asian Elephant. Find out what it likes to eat, where it lives, and its behaviors. Click on the links to the left for more information.
As part of the small mammals exhibit at the National Zoo, this …
As part of the small mammals exhibit at the National Zoo, this site highlights various facts and interesting information on the Banded Mongoose. In addition to several pictures, the site provides a description and information on habitat, diet, reproduction, and more.
This slideshow helps you discover the beginning of embryonic development and how …
This slideshow helps you discover the beginning of embryonic development and how it is fertilized, how it grows, and how it, in turn, becomes a pregnancy. [2:18]
Biology 2e is designed to cover the scope and sequence requirements of a …
Biology 2e is designed to cover the scope and sequence requirements of a typical two-semester biology course for science majors. The text provides comprehensive coverage of foundational research and core biology concepts through an evolutionary lens. Biology includes rich features that engage students in scientific inquiry, highlight careers in the biological sciences, and offer everyday applications. The book also includes various types of practice and homework questions that help students understand—and apply—key concepts. The 2nd edition has been revised to incorporate clearer, more current, and more dynamic explanations, while maintaining the same organization as the first edition. Art and illustrations have been substantially improved, and the textbook features additional assessments and related resources.
By the end of this section, you will be able to do …
By the end of this section, you will be able to do the following:
Define species and describe how scientists identify species as different Describe genetic variables that lead to speciation Identify prezygotic and postzygotic reproductive barriers Explain allopatric and sympatric speciation Describe adaptive radiation
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