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 the following:

Compare homologous and analogous traits
Discuss the purpose of cladistics
Describe maximum parsimony

By the end of this section, you will be able to do the following:

Discuss the need for a comprehensive classification system
List the different levels of the taxonomic classification system
Describe how systematics and taxonomy relate to phylogeny
Discuss a phylogenetic tree's components and purpose

By the end of this section, you will be able to do the following:

Describe horizontal gene transfer
Illustrate how prokaryotes and eukaryotes transfer genes horizontally
Identify the web and ring models of phylogenetic relationships and describe how they differ from the original phylogenetic tree concept

Biology is designed for multi-semester biology courses for science majors. It is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand. To meet the needs of today’s instructors and students, some content has been strategically condensed while maintaining the overall scope and coverage of traditional texts for this course. Instructors can customize the book, adapting it to the approach that works best in their classroom. Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand—and apply—key concepts.

By the end of this section, you will be able to do the following:

Identify and describe the properties of life
Describe the levels of organization among living things
Recognize and interpret a phylogenetic tree
List examples of different subdisciplines in biology

This comprehensive study guide covers the main terms and concepts needed for a unit on classifying organisms.

A free CK-12 account is required to view all materials.

In this transcript of an interview filmed for the PBS series "Evolution," scientists Ted Daeschler and Neil Shubin describe the discovery and significance of some of their key fossil finds.

Each plant is classified according to broad categories based on characteristics they share. New DNA technology has allowed us to be more specific in determining the “relatives” of plants. This activity helps students understand the various ways of classifying to show these different relationships. Use HHMI Biointeractive Click and Learn lesson: Creating Phylogenetic Trees from DNA Sequences for additional background information. This unit features 5 lessons and 9 files. Lessons are aligned to NGSS.

See how scientists trace species through their evolutionary relationships.

A free CK-12 account is required to view all materials.

Visit the virtual exhibits at this site to learn more about paleontology, the history of the earth, and life on earth. Use the information on this site to understand geology, geologic time, evolution, and phylogeny.

The Tree of Life is a multi-authored, Internet distributed project containing information about phylogeny and biodiversity. The Tree of Life can be used to locate information about a particular group of organisms through their taxonomy.

The Tree of Life Web Project contains information on living organisms including their history and characteristics. Over 3,000 web pages are linked together uniting all living things.

This Berkeley site offers a great overview of when the class appears in the fossil record.

Learn how to read and draw phylogenetic trees, or cladograms. [10:57]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.