Crash Course Biology


  • Comparative Anatomy: What Makes Us Animals | Crash Course Biology

    Hank introduces us to comparative anatomy, which studies the similarities and differences in animal anatomy to support the theory of evolution and the shared ancestry of living things.

    Grades: 9-12
  • Simple Animals: Sponges, Jellies, & Octopuses | Crash Course Biology

    Hank introduces us to the least complex animals: beginning with sponges and finishing with the most complex molluscs, octopuses, and squid. We differentiate them by the number of tissue layers they have and by the complexity of those layers.

    Grades: 9-12
  • Complex Animals: Annelids & Arthropods | Crash Course Biology

    Hank continues the exploration of animal phyla with the more complexly organized annelida and arthropoda and a biography on insects.

    Grades: 9-12
  • Chordates | Crash Course Biology

    Hank introduces us to the fascinatingly diverse phyla known as chordata. Everything from slimey sea-snakes to warm, fuzzy animals share one common trait: a backbone.

    Grades: 9-12
  • Animal Behavior | Crash Course Biology

    Hank teaches us about animal behavior and how we can discover why animals do the things they do. A mix of external and internal stimuli help all animals navigate their way through life, while remaining fixated on the goals of eating, mating, avoiding predators, or aiding their young.

    Grades: 9-12
  • The Nervous System | Crash Course Biology

    Hank takes a look at the nervous system and all of the things that it is responsible for in the body.

    Grades: 9-12
  • Circulatory & Respiratory Systems | Crash Course Biology

    Hank takes us on a trip around the body -- we follow the circulatory and respiratory systems as they deliver oxygen and remove carbon dioxide from cells, which helps make it possible for our bodies to function.

    Grades: 9-12
  • The Digestive System | Crash Course Biology

    Hank takes us through the bowels of the human digestive system. From the mouth to the stomach, ending with the expulsion of waste, Hank explains why it's all about surface area when you're dealing with digestion.

    Grades: 9-12
  • The Excretory System: From Your Heart to the Toilet | Crash Course Biology

    Hank takes us on the fascinating journey through our excretory system to learn how our kidneys make pee. Maintaining homeostasis is a challenging feat, and our body's process of excreting urine and waste should not go underappreciated.

    Grades: 9-12
  • The Skeletal System: It's ALIVE! | Crash Course Biology

    Hank introduces us to the framework of our bodies: our skeleton, which, apart from being the support and protection for all our fleshy parts, is involved in many other vital processes that help our bodies to function properly.

    Grades: 9-12
  • Big Guns: The Muscular System | Crash Course Biology

    Hank tells us the story of our muscular system. This complicated chemical dance allows our skeletal muscles to contract and relax.

    Grades: 9-12
  • Your Immune System: Natural Born Killer | Crash Course Biology

    Hank tells us about the team of defenses that make up our immune system. These defenses -- both innate and acquired -- are tasked with protecting our bodies from all the pathogens and bad guys. Luckily, our immune system is so well-honed that we're able to keep all these nasty pathogens at bay.

    Grades: 9-12
  • Great Glands | Your Endocrine System: Crash Course Biology

    Hank fills us in on the endocrine system. This system of glands produces and secretes different types of hormones directly into the bloodstream to regulate the body's growth, metabolism, and sexual development & function.

    Grades: 9-12
  • The Reproductive System: How Gonads Go | Crash Course Biology

    Hank lets us in on the meaning of life, which -- at least from a biological perspective -- is reproduction. From sexual to asexual selection, this video has it all.

    Grades: 9-12
  • Old & Odd: Archaea, Bacteria & Protists | Crash Course Biology

    Hank teaches us about the 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.

    Grades: 9-12
  • The Sex Lives of Nonvascular Plants: Alternation of Generations | Crash Course Biology

    Hank introduces us to nonvascular plants -- liverworts, hornworts, and mosses -- which have bizarre features, kooky habits, and strange sex lives. Nonvascular plants inherited their reproductive cycle from algae, but have perfected it to the point where it is now used by all plants in one way or another and has even left traces in our own reproductive systems.

    Grades: 9-12
  • Vascular Plants = Winning! | Crash Course Biology

    Hank introduces us to one of the most diverse and important families in the tree of life -- the vascular plants. These plants have found tremendous success and their secret is also their defining trait: conductive tissues that can take food and water from one part of a plant to another. Though it sounds simple, the ability to move nutrients and water from one part of an organism to another was a evolutionary breakthrough for vascular plants, allowing them to grow exponentially larger, store food for lean times, and develop features that allowed them to spread further and faster. Plants dominated the earth long before animals showed up and even today hold the world records for the largest, most massive, and oldest organisms on the planet.

    Grades: 9-12
  • The Plants & The Bees: Plant Reproduction | Crash Course Biology

    Hank gets into the dirty details about vascular plant reproduction. Vascular plants use the basic alternation of generations developed by nonvascular plants 470 million years ago, but they've tricked it out so that it works a whole lot differently compared to the way it did back in the Ordovician swamps where it got its start. Here's how the vascular plants (ferns, gymnosperms, and angiosperms) do it.

    Grades: 9-12
  • Fungi: Death Becomes Them | Crash Course Biology

    Death is what fungi are all about. By feasting on the deceased remains of almost all organisms on the planet, converting the organic matter back into soil from which new life will spring, they perform perhaps the most vital function in the global food web. Fungi, which thrive on death, make all life possible.

    Grades: 9-13+
  • Ecology: Rules for Living on Earth | Crash Course Biology

    Hank introduces us to ecology -- the study of the rules of engagement for all of us earthlings -- which seeks to explain why the world looks and acts the way it does. The world is crammed with things, both animate and not, that have been interacting with each other all the time, every day, since life on this planet began, and these interactions depend mostly on just two things. Learn what they are as Crash Course Biology takes its final voyage outside the body and into the world. 

    Grades: 9-13+

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