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Hand-drawn duck detective observes a bubbling beaker and asks for more evidence: bubbles alone do not prove a chemical reaction.

Scientific Reasoning in Chemistry: Plan a Fair Test

Use scientific reasoning in chemistry to separate observations from inferences, plan a fair test and write a conclusion supported by the evidence.

Hand-drawn memory-cell librarian recognizes a microbe’s three-point antigen feature in a scrapbook, illustrating antigen-specific immune memory that helps a later response.

Immunity, Reproduction and Development: Compare Cell Roles

Compare innate and adaptive immunity, fertilization and cell differentiation. Use a process table, a gene-expression example and six practice questions.

Hand-drawn hormone signaling comic compares a cell with a suitable surface receptor and one without; response requires the right receptor and cellular machinery.

Nervous and Endocrine Control: Signals and Movement

Handmade felt comic pairs lungs exchanging oxygen into blood and carbon dioxide out with a heart courier driving blood flow, showing their distinct roles in oxygen delivery.

Transport and Exchange: Oxygen, Nutrients and Kidneys

Hand-drawn hedgehogs stand in woodland patches separated by roads and fields, showing how habitat fragmentation can disrupt wildlife movement and connections.

Human Impact on Biodiversity: Climate and Nutrient Pollution

Hand-painted pond snapshots compare same-species frogs as a population with frogs, a snail, a dragonfly, plants and fungi representing an ecological community.

Populations, Communities and Biomes: Compare Ecology Levels

Hand-sketched axolotl watches a DNA gel with negative wells above and a positive electrode below; a 200-base-pair fragment travels farther than a 900-base-pair fragment under the same suitable conditions.

Biotechnology Tools: PCR, DNA Gels and Gene Editing

Watercolor comic of a nerve cell and muscle cell backstage with identical DNA manuals and different work cues, illustrating how different gene expression supports specialized cell functions.

Gene Regulation and Cell Specialization: RNA and Proteins

Magenta and orange hand-drawn rabbit accepts a zero-dollar video lesson ticket while a cheerful clock highlights time and attention; compare privacy and benefits alongside the money price.

Zero Money Price vs. Economic Cost: Why Free Has Tradeoffs

Scratchy blue ink comic of puffin classmates joining a smartphone clubhouse, showing a direct network effect as their participation makes a study-group messaging app more useful.

Network Effects: Growth, Competition and Concentration

Hand-painted comic of an octopus dispatcher connecting a mouse restaurant, badger customer and turtle courier on linked seesaws, illustrating how platform fees and rules affect participation across groups.

Platform Markets: How Interdependent Groups Interact

Sepia pen and blue watercolor comic of a beaver making clear keep and reschedule options on an appointment reminder while a woman freely chooses, illustrating choice architecture and personal agency.

Choice Architecture: Evaluate Evidence and Preserve Agency

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