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- Season 1 That's Why Carbon Is A Tramp
- Season 1 Water - Liquid Awesome
- Season 1 Biological Molecules - You Are What You Eat
- Season 1 Eukaryopolis - The City of Animal Cells
- Season 1 In Da Club - Membranes & Transport
- Season 1 Plant Cells
- Season 1 ATP & Respiration
- Season 1 Photosynthesis
- Season 1 Heredity
- Season 1 DNA Structure and Replication
- Season 1 DNA, Hot Pockets, & The Longest Word Ever
- Season 1 Mitosis: Splitting Up is Complicated
- Season 1 Meiosis: Where the Sex Starts
- Season 1 Natural Selection
- Season 1 Speciation: Of Ligers & Men
- Season 1 Animal Development: We're Just Tubes
- Season 1 Evolutionary Development: Chicken Teeth
- Season 1 Population Genetics: When Darwin Met Mendel
- Season 1 Taxonomy: Life's Filing System
- Season 1 Evolution: It's a Thing
- Season 1 Comparative Anatomy: What Makes Us Animals
- Season 1 Simple Animals: Sponges, Jellies, & Octopuses
- Season 1 Complex Animals: Annelids & Arthropods
- Season 1 Chordates
- Season 1 Animal Behavior
- Season 1 The Nervous System
- Season 1 Circulatory & Respiratory Systems
- Season 1 The Digestive System
- Season 1 The Excretory System: From Your Heart to the Toilet
- Season 1 The Skeletal System: It's ALIVE!
- Season 1 Big Guns: The Muscular System
- Season 1 Your Immune System: Natural Born Killer
- Season 1 Great Glands - Your Endocrine System
- Season 1 The Reproductive System: How Gonads Go
- Season 1 Old & Odd: Archaea, Bacteria & Protists
- Season 1 The Sex Lives of Nonvascular Plants: Alternation of Generations
- Season 1 Vascular Plants = Winning!
- Season 1 The Plants & The Bees: Plant Reproduction
- Season 1 Fungi: Death Becomes Them
- Season 1 Ecology - Rules for Living on Earth
Crash Course Biology - Season 1 Episode 35 Old & Odd: Archaea, Bacteria & Protists
1.50 15 minutes Hank veers away from human anatomy to teach us about the (mostly) single-celled organisms that make up two of the three taxonomic domains of life, and one of the four kingdoms: Archaea, Bacteria, and Protists. They are by far the most abundant organisms on Earth, and are our oldest, oddest relatives.
