Foundations of Biology
Choose a unit and work through each mobile-friendly, self-paced lesson.
SKILLSUnit 0 - Scientific Skills
Practice observations, inferences, hypotheses, variables, data tables, graphs, and repeated trials.
Open Unit 0 lessonBIO.1Unit 1 - BIO.1A - Characteristics of Life
Identify the characteristics shared by living things and apply them to examples.
Open Unit 1 lessonTake the Unit 1 review quizBIO.1Unit 2 - BIO.1B - Macromolecules & Enzymes
Explore biological macromolecules, enzymes, and the patterns that connect structure to function.
Open Unit 2 lessonTake the Unit 2 review quizBIO.1Unit 3 - BIO.1C - Cells & Organelles
Compare cells, identify organelles, and connect cell structures to their jobs.
Open Unit 3 lessonTake the Unit 3 review quizBIO.1Unit 4 - BIO.1D - Cell Transport
Model membrane transport and explain how cells maintain homeostasis.
Open Unit 4 lessonTake the Unit 4 review quizBIO.1Unit 5 - BIO.1E - Cell Cycle & Asexual Reproduction
Follow the cell cycle, order the stages of mitosis, and connect cell division to asexual reproduction.
Open Unit 5 lessonTake the Unit 5 review quizBIO.2Unit 6 - BIO.2 - Energy Transfer
Follow energy and matter through ATP, photosynthesis, cellular respiration, and oxygen pathways.
Open Unit 6 lessonTake the Unit 6 review quizBIO.3Unit 7 - BIO.3A - Meiosis and Reproduction
Track chromosome number through meiosis and fertilization, then read a karyotype.
Open Unit 7 lessonTake the Unit 7 quizBIO.3Unit 8 - BIO.3B - Genetics & Inheritance
Use allele letters, Punnett squares, and pedigrees to describe inheritance patterns.
Open Unit 8 lessonTake the Unit 8 quizBIO.3Unit 9 - BIO.3C - DNA & Protein Synthesis
Build complementary DNA strands, then follow information from DNA to RNA to protein.
Open Unit 9 lessonTake the Unit 9 quizBIO.4Unit 10 - BIO.4 - Evolution
Model natural selection, examine evolutionary evidence, and read cladogram branch points.
Open Unit 10 lessonTake the Unit 10 quizBIO.5Unit 11 - BIO.5 - Ecology
Follow energy and matter through ecosystems, then model succession and population limits.
Open Unit 11 lessonTake the Unit 11 quiz