Confused? Need a review? Check out these videos:
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Unit 1 - Characteristics of Life & the Basic Unit of Life
Characteristics of Life (7:56, Amoeba Sisters)
Homeostasis and Negative/Positive Feedback (6:24, Amoeba Sisters)
Prokaryotic vs. Eukaryotic Cells (5:27, Amoeba Sisters)
Biology: Cell Structure (7:21, cell animation)
Introduction to Cells: The Grand Tour (9:26, Amoeba Sisters)
Eukaryopolis - The City of Animal Cells (11:34, CrashCourse)
Unit 2 - Chemistry of Life
Parts of an Atom (2:23, FuseSchool)
Properties of Water (6:50, Amoeba Sisters)
Water: Liquid Awesome (11:16, CrashCourse)
Enzymes (Updated) (5:46, Amoeba Sisters)
Biological Molecules - You Are What You Eat (14:08, CrashCourse)
Diffusion and Osmosis - Membranes and Transport (Khan Academy, 18:58)
In Da Club - Membranes & Transport (11:17, CrashCourse)
Biology: Cell Transport (2:02, cell animation)
Cell Transport (Amoeba Sisters, 7:49)
Unit 3 - Matter and Energy in Living Systems
Food Webs and Energy Pyramids (5:48, Amoeba Sisters)
Links in the Chain (10:09, CrashCourse)
Unit 4 - Ecosystems: Stability and Change
Human Population Through Time (6:24, American Museum of Natural History)
Ecological Relationships (6:49, Amoeba Sisters)
Symbiosis: Mutualism, Commensalism, and Parasitism (5:16, Untamed Science)
Ecological Succession (6:23, Amoeba Sisters)
Unit 5 - Cells: Stability and Change
The Cell Cycle (and Cancer) (9:19, Amoeba Sisters)
Cell Cycle and Mitosis [3D Animation] (6:20, McGraw-Hill)
Mitosis: The Amazing Cell Process that Uses Division to Multiply! (8:27, Amoeba Sisters)
Mitosis: Splitting Up is Complicated (10:47, CrashCourse)
Unit 6 - The Structure and Function of DNA
What is DNA and How Does it Work? (5:23, Stated Clearly)
DNA Structure and Replication (12:59, CrashCourse)
DNA Replication: The Cell's Extreme Team Sport (7:59, Amoeba Sisters)
DNA Replication - 3D (3:28, Your Genome)
From DNA to protein - 3D (2:41, Your Genome)
Unit 7 - Genetics and Heredity
What is a gene? (4:56, Stated Clearly)
How Mendel's Pea Plants Helped Us Understand Genetics (3:07, Ted Ed)
Incomplete Dominance, Codominance, Polygenic Traits, and Epistasis! (7:12, Amoeba Sisters)
Multiple Alleles (ABO Blood Types) and Punnett Squares (7:05, Amoeba Sisters)
Pedigrees (6:08, Khan Academy)
Unit 8 - Evidence for Evolution
What is evolution? (8:52, Stated Clearly)
Evolution: It's a Thing (11:44, Crash Course)
What is Natural Selection? (9:18, Stated Clearly)
What is the Evidence for Evolution? (11:21, Stated Clearly)
Evidence for Evolution (12:59, Khan Academy)
Unit 9 - Patterns of Evolution
Natural Selection (12:44, CrashCourse)
Does the Theory of Evolution really matter? (9:53, Stated Clearly)
Population Genetics: When Darwin Met Mendel (11:04, CrashCourse)
Speciation (7:33, Amoeba Sisters)
Speciation: Of Ligers and Men (10:25, CrashCourse)
Genetic Drift (4:38, Amoeba Sisters)
Unit 10 - Human Impacts on the Environment