ALL NEW FOR 2026–27!
FIFTH EDITION—OUR BIGGEST AND BEST EVER!
ALL-NEW ARTICLES, IMAGES, HYPOTHETICALS, IV/DV/HYPOTHESIS ACTIVITIES, DATA ANALYSIS, SLIDE DECKS, AND FULL LECTURE NOTES!
Aligned to Next Generation Science Standards and Texas TEKS
We listened to your feedback and rebuilt 25x: Biology for its Fifth Edition. Every lesson now features an all-new article, new images, updated hypotheticals, and redesigned reflection questions that connect biology to students’ lives. Fewer, more meaningful prompts encourage deeper discussion, critical thinking, and real-world application.
New Independent Variable, Dependent Variable, and Hypothesis Activities and Data Analysis Activities give students repeated practice identifying variables, designing investigations, interpreting data, and drawing evidence-based conclusions. Every lesson also includes a ready-to-use slide deck and full lecture notes.
At more than 527 pages , this workbook contains 25 complete biology lessons with guided notes, vocabulary, scientific reasoning activities, and reinforcement exercises. The teacher edition provides complete answer keys for all activities, including guided notes, reflections, hypotheticals, data analysis, crosswords, and word searches.
A student/classroom edition without answer keys is also available on Amazon.
Why Teachers Love 25x: Biology Clarifies complex biology topics Connects science to everyday life and careers Builds critical thinking and data-analysis skills Includes lecture notes and ready-to-use slide decks Engages students with hypotheticals, puzzles, and guided notes Provides complete answer keys Aligns with NGSS and Texas TEKS Each Lesson Includes An all-new high school biology article New instructional images Guided notes for classroom use Meaningful reflection questions New real-world hypotheticals An IV/DV/Hypothesis Activity A Data Analysis Activity 14 vocabulary terms A crossword and word search A ready-to-teach slide deck Full lecture notes and answer keys Table of Contents
25x: Biology—Volume 1, Fifth Edition
X. What Is Biology?
Unit 1: Foundations of Life and Cell Structure Lesson 1: Characteristics of Life — HS-LS1-2
Lesson 2: Water and Macromolecules — HS-LS1-6
Lesson 3: Enzymes — HS-LS1-1
Unit 2: Cell Structure and Function Lesson 4: Cell Theory and Types of Cells — HS-LS1-2
Lesson 5: Cell Organelles and Functions — HS-LS1-2
Lesson 6: Cell Cycle — HS-LS1-4
Unit 3: Energy and Metabolism Lesson 7: Photosynthesis — HS-LS1-5
Lesson 8: Cellular Respiration — HS-LS1-7
Lesson 9: Aerobic and Anaerobic Respiration — HS-LS1-7
Lesson 10: Fermentation — HS-LS1-7
Unit 4: Molecular Biology and Gene Expression Lesson 11: Structure and Function of DNA and RNA — HS-LS1-1
Lesson 12: DNA Replication — HS-LS1-1
Lesson 13: Protein Synthesis — HS-LS1-1
Lesson 14: Meiosis — HS-LS1-4
Lesson 15: Inheritance — HS-LS3-1
Lesson 16: Mendelian Genetics — HS-LS3-2
Lesson 17: Mutations — HS-LS3-2
Unit 5: Evolution Lesson 18: Evolution and Natural Selection — HS-LS4-2
Lesson 19: Population Genetics — HS-LS4-3
Lesson 20: Mechanisms of Evolution — HS-LS4-4
Unit 6: Ecology Lesson 21: Ecology and Energy Flow — HS-LS2-3
Lesson 22: Population Ecology — HS-LS2-1
Lesson 23: Biogeochemical Cycles — HS-LS2-3
Lesson 24: Symbiosis and Species Interactions — HS-LS2-8
Lesson 25: Ecological Succession — HS-LS2-7
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