Reading list.

Use the assigned sections before the linked analysis, then compare the source claims with the supplied data. Each pathway gives original questions, expected outputs, worked calibration, a transfer question and criterion-linked evidence. Print the unit learning page alongside its five-page assessment companion.

Choose a supported reading or accessible response format by readiness; foundation/core/honors are not credit promises. Source records, simulations and personal observations must remain distinct. The readings do not authorize collection, cultures, dissection or ingestion.

Eight assigned reading routes

• 01: OpenStax Biology 1.2, Properties of Life; Microbiology 3.1, Redi and Figure 3.2 — card classifications, germination graph and controlled-comparison response.
• 02: OpenStax Biology 4.1, Microscopy and Cell Theory; 4.3, cell diagram and functions — timeline and scaled evidence note.
• 03: Harvey, Chapters VIII–IX in the free English translation; OpenStax Biology 40.1 — flow map and circulation argument with synthetic rates.
• 04: OpenStax Biology 12.1, Mendel’s Model System, Crosses and flower counts — defined Pp x Pp probabilities and historical/synthetic comparison.
• 05: OpenStax Biology 18.1, Darwin and Natural Selection, evidence and misconceptions; 20.1, trees — two-environment model and branching-evidence response.
• 06: Linnean Society, His career and legacy; OpenStax Biology 20.1, Classification Levels — tested key and naming/ancestry distinction.
• 07: NPS Elk and The Big Scientific Debate; USGS Yellowstone wolf restoration; OpenStax 46.2 — dated source comparison, food web and multi-factor evidence brief.
• 08: EPA DDT - A Brief History and Status; OpenStax Biology 47.3 — regulation context and matched-site decision memo.

The unit pages link directly to each free source and specify the section or figure. Links and assigned passages were checked on 27 September 2026. Agency pages may change; the cited data tables preserve the values used for these tasks.

The textbook is not the teacher. The bench is the teacher; the text is the reference you reach for afterward.

The remaining list offers optional background. It does not replace the assigned sections or permit a source title alone to stand in for a task.

Free core texts

You do not need to buy a textbook to run this course well. Two excellent, genuinely free options cover everything in the course map at the right level.

• CK-12 Life Science for Middle School. A free, modular life science text written for grades 6–8, with adjustable reading levels and built-in practice. Its chapters map cleanly onto our eight units — needs of living things, cells, body systems, genetics and heredity, evolution and adaptation, classification, ecosystems, and human impact. This is our default reference text: when a lab note says “read more on how cells work,” this is where to go.
• OpenStax Concepts of Biology. A complete, peer-reviewed, free introductory biology text, readable online or as a PDF. It is pitched a bit older than middle school — be honest with a young reader about that — but it’s an excellent step-up for a strong reader who wants more depth on a topic than CK-12 gives.

Between these two, a family can run the entire year without spending a dollar on text. Keep a struggling reader in CK-12, and let a strong reader reach into OpenStax on the topics that grab them.

The optional textbook

Some families like having one printed textbook on the shelf as a backup reference. It is genuinely optional — the free texts above are entirely sufficient — but if you want one, keep it simple.

• A middle-school life science textbook — any recent, well-reviewed edition. Any current grade 6–8 life science book from a mainstream publisher covers the same ground as CK-12. A used earlier edition costs a fraction of the current one and loses almost nothing for our purposes; the core science has not changed. Buy one only if you like having a physical reference to flip through. Otherwise the free texts above are all you need.

Trade books that bring life science alive

This is the part of the list we care about most. A textbook tells you what is true; these books show you how the truth was found — the patient watching, the stubborn observations, the human stakes. They are how a student comes to feel that life science is a living investigation rather than a settled catalog. Recommend one per semester as a slow read alongside the lab work.

• Hidden Worlds: Looking Through a Scientist’s Microscope — Kathryn Lasky. A look at microscopist Dennis Kunkel’s work and images, not a biography of Leeuwenhoek. Optional alongside the assigned microscopy sources.
• The Immortal Life of Henrietta Lacks — Rebecca Skloot. An optional adult history of cell research and its human stakes; a guide should review suitability before suggesting it. No young-readers edition or purchase is assumed by this course.
• One Beetle Too Many — Kathryn Lasky. A picture-book biography of Charles Darwin, from a boy who collected everything to the naturalist who explained why life changes over time. A natural companion to the Evolution & Adaptation unit.
• Citizen Scientists — Loree Griffin Burns. Ordinary people counting butterflies, birds, frogs, and ladybugs — real ecology done by real families. It models exactly the observe-and-record habit this course is built to cultivate, and shows students their own backyard counts.
• The Wild Robot — Peter Brown (optional fifth). A novel about a robot learning to survive in a wild ecosystem — a gentle, story-driven pairing with the ecosystems and adaptation units if a class wants a read-aloud.

Reference works

Finally, a couple of reference works earn their shelf space — things to keep open on the bench, not to read cover to cover.

• A good field guide or two — a regional guide to trees, birds, insects, or pond life, kept on the bench and reached for whenever a student brings something in to identify. Referenced across the classification and ecosystems units.
• A simple dichotomous key for the classification and sorting work — a one-page tool that walks a student through yes/no questions to name what they’re looking at, so they can check a leaf or insect against a known path.
• A labeled cell and body-systems poster pinned above the bench — a large, clear diagram of a cell and the major body systems, referenced constantly and far more useful in eyeshot than buried in a chapter.

Keep the list short and the books close. A family that reads two of these trade books slowly, anchored to real lab work, will finish the year with something a stack of chapters never delivers: the sense that life science is a thing people do, and that the student has now done a little of it.