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:

Describe the basic structure of a typical prokaryote
Describe important differences in structure between Archaea and Bacteria

Great explanation of "if" clauses in the present indicative tense that are used in sentences with the future tense. A short exercise tests the student's mastery of the principle and reviews a variety of present and future tense conjugations. Answers may be checked and corrected.

Completion of these twenty-five clauses provide extensive practice of the past subjunctive tense. Verb infinitives are provided that need to be conjugated in the imperfect subjunctive according to the subject that proceeds it. Answers may be checked and corrected.

This Spanish grammar exercise provides adequate practice conjugating verbs in the conditional tense and in the past subjunctive in sentences that contain "if" clauses. Answers may be checked and corrected.

Great explanation of "if" clauses and when to use the present indicative tense. A short exercise tests the student's mastery of the principle and reviews a variety of present tense conjugations. Answers may be checked and corrected.

Excellent presentation of the future tense in a poem, "Novia del campo, amapola."

Fantastic explanation of spelling changes in the Spanish language and their effect upon conjugations in the present subjunctive. Verb infinitives that end in -car, -gar, and -zar are among those that are considered. A quiz at the end of the lesson tests the student's mastery of verb conjugations in the present subjunctive that are altered by orthographical changes.

This TurtleDiary interactive video lesson [2:05] features information about verb conjugation. Practice exercises are provided to supplement this verb conjugation lesson.