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General Biology II · Modules 1 to 16

See It: General Biology II

See evolution, diversity and ecology happen. Each module has an animated walkthrough that links the ecosystem, the organism and the cell, with worked examples for every calculation, and a Lab with simulators, a practice trainer, a sorting game and real-world data scenarios. Everything runs in your browser on a computer, tablet or phone. No login, nothing graded.

How to use this: open the walkthrough first and go at your own pace with the arrow keys or Next. Then open the Lab: run the simulator, practice in the trainer with its hints and worked solutions, and try the real-world scenarios. Use the tools bar at the top of each page to pause the animations, slow them down, have the text read aloud, or get a written description of each picture. Nothing here is graded.

Module 1 Evolution and natural selection

Ideas before Darwin, how natural selection works, measuring selection, evolution we can watch, and the evidence from homology, fossils and biogeography.

Start here · Animated walkthroughEvolution and natural selection WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 1 LabSelection island simulator, selection trainer, evidence sorting, and real-world scenarios.

Module 2 Population genetics

Genetic variation, allele frequencies, Hardy-Weinberg, genetic drift, founder effects and bottlenecks, gene flow, modes of selection and balancing selection.

Start here · Animated walkthroughPopulation genetics WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 2 LabAllele frequency simulator, Hardy-Weinberg trainer, matching rounds, and real-world scenarios.

Module 3 Speciation

Species concepts, prezygotic and postzygotic barriers, allopatric and sympatric speciation, polyploidy, hybrid zones and the tempo of speciation.

Start here · Animated walkthroughSpeciation WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 3 LabSpeciation island bench, barrier and chromosome trainer, sorting rounds, and real-world scenarios.

Module 4 Phylogeny and the history of life

Origin of life, fossils and radiometric dating, the geologic time scale, mass extinctions, reading and building trees, parsimony, molecular clocks and the three domains.

Start here · Animated walkthroughPhylogeny and the history of life WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 4 LabTree builder, deep time machine, phylogeny trainer, order and sort games, and real-world scenarios.

Module 5 Bacteria, archaea and viruses

Prokaryote structure, growth and horizontal gene transfer, nutritional modes, bacteria vs archaea, ecological roles, and virus structure and life cycles.

Start here · Animated walkthroughBacteria, archaea and viruses WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 5 LabCulture, phage and plasmid bench, microbe trainer, feature sorter, and real-world scenarios.

Module 6 Protists

What protists are, endosymbiosis, the eukaryotic supergroups, malaria and other life cycles, and the ecological roles of protists.

Start here · Animated walkthroughProtists WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 6 LabPond microscope, malaria explorer, protist trainer, sorting rounds, and real-world scenarios.

Module 7 Plant diversity

Moving onto land, traits of land plants, bryophytes, seedless vascular plants, gymnosperms and angiosperms, and the shrinking gametophyte.

Start here · Animated walkthroughPlant diversity WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 7 LabLife cycle explorer, ploidy trainer, matching rounds, and real-world scenarios.

Module 8 Plant structure and growth

Roots, stems and leaves, tissue systems and cell types, meristems, primary growth of roots and shoots, leaf anatomy and secondary growth.

Start here · Animated walkthroughPlant structure and growth WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 8 LabGrowing plant and tree ring bench, plant anatomy trainer, sorting rounds, and real-world scenarios.

Module 9 Plant transport and nutrition

Water potential, routes through the root, cohesion tension in the xylem, stomata and transpiration, phloem pressure flow, and soil nutrients and partners.

Start here · Animated walkthroughPlant transport and nutrition WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 9 LabWhole plant water and sugar bench, water potential trainer, matching rounds, and real-world scenarios.

Module 10 Plant reproduction and responses

Flowers and gametophytes, pollination, double fertilization, seeds and fruits, asexual reproduction, plant hormones, light and timing, and tropisms.

Start here · Animated walkthroughPlant reproduction and responses WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 10 LabPlant response bench, prediction trainer, matching rounds, and real-world scenarios.

Module 11 Fungi

Hyphae and mycelium, mycorrhizae, fungal life cycles, the major fungal groups, decomposers, mutualists and pathogens, and fungi in people's lives.

Start here · Animated walkthroughFungi WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 11 LabFungus bench, fungi trainer, sorting rounds, and real-world scenarios.

Module 12 Animal diversity

Body plans, germ layers and body cavities, protostomes and deuterostomes, the invertebrate phyla, chordates, vertebrate innovations, and primates.

Start here · Animated walkthroughAnimal diversity WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 12 LabBody plan builder, embryo viewer, key and tree trainer, matching rounds, and real-world scenarios.

Module 13 Animal form, function and homeostasis

Size and exchange, tissues, feedback, thermoregulation, metabolic rate and scaling, and how digestion, circulation, gas exchange and excretion compare across animals.

Start here · Animated walkthroughAnimal form, function and homeostasis WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 13 LabComparative physiology bench, physiology trainer, matching rounds, and real-world scenarios.

Module 14 Animal reproduction and development

Asexual and sexual reproduction, gametogenesis, the ovarian and uterine cycles, pregnancy and birth, fertilization, cleavage, gastrulation, organogenesis and developmental signals.

Start here · Animated walkthroughAnimal reproduction and development WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 14 LabEmbryo and hormone bench, development trainer, order and match games, and real-world scenarios.

Module 15 Population and community ecology

Density and dispersion, demography, exponential and logistic growth, population cycles, species interactions, diversity, food webs, keystone species and succession.

Start here · Animated walkthroughPopulation and community ecology WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 15 LabPopulation bench, ecology math trainer, matching rounds, and real-world scenarios.

Module 16 Ecosystems, biomes and conservation

Energy flow and trophic efficiency, productivity, biogeochemical cycles, climate and biomes, biodiversity threats, conservation biology and global change.

Start here · Animated walkthroughEcosystems, biomes and conservation WalkthroughWatch the biology happen step by step, with quick checks and animated worked examples. Simulators + practiceModule 16 LabEcosystem bench, ecosystem trainer, sorting rounds, and real-world scenarios.