Crash Course Biology

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  • : 90
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  • YouTube
  • 17
  • Documentary

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2x1
Introduction to Biology
Episode overview
Biology is the study of life—a four-letter word that connects you to 4 billion years worth of family tree. The word “life” can be tricky to define, but a shared set of characteristics .. show full overview
2x2
The Scientific Method
Episode overview
Science offers a way of discovering and understanding the world around us, driven by questions and tested with evidence. And it’s a twisty-turny team effort— you won’t find many lone .. show full overview
2x3
What Biologists Do
Episode overview
A biologist’s natural habitat is anywhere questions about life are being asked—whether the subject is a nematode or a narwhal, a single cell, or a whole ecosystem. In this episode of .. show full overview
2x4
How Life is Organized
Episode overview
Here on Earth, life is dizzyingly diverse—but it’s also surprisingly organized. A sense of order structures life and its processes, from the tiniest cell to the total sum of every living .. show full overview
2x5
Why Did All These Elephants Die? (Intro to Ecology)
Episode overview
Ecology is the study of the interactions of living things with each other and their environment. It’s a field that not only lets us explore the interconnections between living things, .. show full overview
2x6
How Species Make and Break Friendships (Community Ecology)
Episode overview
Community ecology is the study of interactions between different species of living things, and lets ecologists examine the effects of predator-prey relationships, parasites, and mutually .. show full overview
2x7
How Did Population Ecology Save the Bald Eagle?
Episode overview
When the Bald Eagle population started to decline in the mid-20th century, scientists began to ask why. Population ecology, the study of organisms of the same species, played a big role .. show full overview
2x8
What is Climate Change?
Episode overview
Life on Earth has weathered boiling-hot oceans and volcanic-ash-darkened skies—but that’s nothing like the climate change we’re experiencing now. In this episode of Crash Course Biology, .. show full overview
2x9
The Effects of Climate Change
Episode overview
Climate change shakes up all of Earth’s systems, including the living ones. In this episode of Crash Course Biology, we’ll see how climate change’s effects rattle the entire chain of .. show full overview
2x10
Conservation Biology: How We Keep Life's Jenga Tower From Toppling
Episode overview
Some scientists believe we are in the middle of Earth’s sixth mass extinction: a big, precarious game of Jenga that involves every ecosystem on the planet. In this episode of Crash .. show full overview
2x11
What a weirdly long giraffe nerve can teach us about evolution
Episode overview
From a single-celled common ancestor, evolution has brought us all of Life’s Greatest Hits — including butterflies, beetles, bacteria, and human beings. In this episode of Crash Course .. show full overview
2x12
Microevolution: What's An Allele Got to Do With It?
Episode overview
Whether we’re talking about tigers, trees, or tarantulas, evolution happens at the level of the population. In this episode of Crash Course Biology, we’ll find out how natural selection, .. show full overview
2x13
Natural Selection: Life's Way of Stayin' Alive
Episode overview
There are lots of ways that evolution happens, and natural selection is just one of them. In this episode of Crash Course Biology, we’ll find out how this process works and shapes traits .. show full overview
2x14
Why do we have different skin colors?
Episode overview
In this episode of Crash Course Biology, we’ll learn about the ways population genetics reveals how groups of living things evolve—by comparing genetic similarities and differences. .. show full overview
2x15
Where Do Species Come From? (Speciation)
Episode overview
How can you tell two species apart? It’s not always simple. In this episode of Crash Course Biology, we’ll learn about speciation—a process that can happen over millions of years, or .. show full overview
2x16
How Did Life Begin? (Evolutionary History)
Episode overview
Humans may have been around for a long time, but life has existed for way longer. In this episode of Crash Course Biology, we’ll journey through deep time to uncover the history of life .. show full overview
2x17
How We're All Related (Phylogeny)
Episode overview
Crocodiles, and birds, and dinosaurs—oh my! While classifying organisms is nothing new, phylogeny— or, grouping organisms by their evolutionary relationships—is helping us see life in a .. show full overview
2x18
Humans Develop Butt First (and other insights from the Tree of Life)
Episode overview
Everywhere you look on Earth, you’ll find wonderful and diverse living things, from tiny tardigrades to soaring sequoias. And incredibly, everything alive today, and everything that’s .. show full overview
2x19
Humans Didn't Evolve From Chimps (Human Evolution)
Episode overview
What’s a human? And how did we become humans, anyway? In this episode of Crash Course Biology, we’ll meet some of our closest relatives and trace how we evolved into the brainy, inventive, complex species we are today.
2x20
What is Life Made of? (Carbon & Biological Molecules)
Episode overview
Despite the diverse appearance and characteristics of organisms on Earth, the chemicals that make up living things are remarkably similar, often identical. In this episode of Crash .. show full overview
2x21
A Love Letter to H2O: Water & pH
Episode overview
This is a love letter to water, life’s solvent, and one of the most wonderful molecules around. In this episode of Crash Course Biology, we’ll learn about how water’s polarity and .. show full overview
2x22
How We See What We Can't See (Microscopes)
Episode overview
There’s an immense world of tiny stuff within us and around us—but how do we know about it? In this episode of Crash Course Biology, we’ll discover how we see what we can’t see, thanks .. show full overview
2x23
A Tour of the Cell
Episode overview
The cell is the basic unit of life, and our understanding of it has advanced as science, and the tools available to scientists, has advanced. In this episode of Crash Course Biology, .. show full overview
2x24
How Does Stuff Get Into Your Cells? (Cell Membranes)
Episode overview
The cell membrane is a protein-studded phospholipid bilayer that not only protects our cells, but also regulates what goes in and out. In this episode of Crash Course Biology, we’ll look .. show full overview
2x25
How Do Cells Communicate? (Cell Communication)
Episode overview
Even though it might seem like our bodies are on autopilot, there is a whole lot happening inside us to keep things moving. In this episode of Crash Course Biology, we’ll learn that our .. show full overview
2x26
How Do We Get Energy? (Chemical Reactions)
Episode overview
Cells need energy to power the chemical reactions that keep their microscopic cities running, and most of that energy comes from a chemical called ATP. In this episode of Crash Course .. show full overview
2x27
How do cells get their energy? (Electron Transport Chain)
Episode overview
You know ‘em, you love ‘em. They’re the powerhouse of the cell: mitochondria. They produce the ATP molecules that we use to do everything from talk to our friends to run a marathon. In .. show full overview
2x28
Photosynthesis: The Original Solar Power
Episode overview
Photosynthesis is a powerful process that is responsible for some of life’s most vital functions. In fact, consumers like us rely on photosynthetic producers to harness energy from the .. show full overview
2x29
Mitosis and the Cell Cycle
Episode overview
What’s the life of a cell like? In this episode of Crash Course Biology, we’ll follow a cell’s life cycle, from its beginning as a shiny new cell all the way to division via mitosis. .. show full overview
2x30
Why Are All Humans Unique? Meiosis
Episode overview
Ever wonder why we aren’t exact clones of our parents, or why siblings aren’t exactly alike? The reason traces back to meiosis. In this episode of Crash Course Biology, we’ll discover .. show full overview
2x31
Why Your Cat Looks Like That: Genetics
Episode overview
How do traits get passed down in our DNA? And what do genes have to do with cat fur? In this episode of Crash Course Biology, we’ll untangle the simplest patterns of inheritance, and reassure our redheaded friends—you’re not going anywhere.
2x32
Nature? Nurture? Not so simple: Genetic Traits
Episode overview
It’s not nature versus nurture—it’s both! In this episode of Crash Course Biology, we’ll explore how complex interactions between genes and the environment shape all sorts of traits, from human skin color to honeybees’ “royal jelly.”
2x33
Our Instruction Manual for Existing: DNA Structure & Replication
Episode overview
Your DNA contains all the instructions your body needs to function. In this episode of Crash Course Biology, we’ll figure out what this giant instruction manual looks like and how this .. show full overview
2x34
How mRNA helped save lives: DNA Transcription
Episode overview
You’ve probably heard of mRNA, thanks to the COVID-19 vaccine. But what is mRNA exactly? In this episode of Crash Course Biology, we learn about the role of messenger RNA in living .. show full overview
2x35
How RNA gets translated into protein power
Episode overview
How does the information from mRNA turn into a protein? It all comes down to translation, where nucleotides are translated into a chain of amino acids. In this episode of Crash Course .. show full overview
2x36
How Genes Express Themselves
Episode overview
If nearly all your cells have the same DNA, why are muscle cells so different from skin cells? In this episode, we’ll learn how gene expression is regulated in eukaryotes, and how .. show full overview
2x37
Is drinking milk a Superpower? Genetic Mutations
Episode overview
Science fiction is full of superpowered mutants, but in reality, mutations are much more diverse and complex. Sometimes, they can change someone’s entire body, and other times, we don’t .. show full overview
2x38
We’re full of bacteria!
Episode overview
Bacteria often get a bad rap, but they’re some of our best partners in science and medicine! In this episode, we’ll explore what bacteria are doing with their DNA — including how they .. show full overview
2x39
How Do Vaccines Work?: Viruses & Vaccines
Episode overview
From the flu to COVID-19, viruses are a major threat in our everyday lives. In today’s episode of Crash Course Biology, we’ll learn why viruses are like genes in a box, and how they .. show full overview
2x40
Algorithms Aren’t Just for TikTok: Bioinformatics
Episode overview
On its own, a huge DNA sequence is a meaningless pile of data — so, how do biologists figure out what it means? They turn to the power of bioinformatics! In this episode, we’ll learn .. show full overview
2x41
Why We Aren’t Just One Big Cell: Multicellular Function
Episode overview
There are countless types of plants and animals on Earth, but how do they work? In this episode of Crash Course Biology, we’ll take a bird’s eye view of how multicellular life functions, .. show full overview
2x42
Plants Are Hardcore: Plant Anatomy & Physiology
Episode overview
Plants may not seem like they’re doing much, but if you look closer, you’ll find a whole world just lurking beyond the surface. We’re talking chemical defenses, highways, and even ways .. show full overview
2x43
The Poop Episode: How Animals Turn Resources Into Waste
Episode overview
Yep, this is the poop episode. Getting resources and getting rid of waste is so important, we have three whole systems dedicated to it! In this episode, we’ll learn how the respiratory .. show full overview
2x44
Why You’re More Than Goo: Animal Infrastructure
Episode overview
When you think about the body’s infrastructure, you probably think of bones. But what about the heart, the blood vessels, and the lymphatic system? In this episode of Crash Course .. show full overview
2x45
How Skin, Snot, and Cells Keep Us Healthy: Animal Defense Systems
Episode overview
The world is full of microbes and viruses that can get us sick, but we’ve got an Avengers-style defense system ready to take them on. In this episode of Crash Course Biology, we’ll learn .. show full overview
2x46
What REALLY Happens When You Step on a Lego: Nervous & Endocrine Systems
Episode overview
If cells and organs never talked to each other, an animal would fall apart faster than a boy band after the popular one goes solo. Thankfully, that’s where the nervous and endocrine .. show full overview
2x47
How Animals Do It: Sexual & Asexual Reproduction
Episode overview
When it comes to animal reproduction, there’s no one-size-fits-all strategy. Some animals need a mate, others don’t, and for some, it depends! In this episode, we’ll learn about sexual .. show full overview
2x48
Gender, Sex, & Sexuality: What’s the Difference?
Episode overview
We tend to think life fits in two tidy categories: male or female, XX or XY. But it’s so much more diverse and complicated! In this episode of Crash Course Biology, we’ll discover sex .. show full overview
2x49
Why This Toad is Bad at Jumping, and Other Mysterious Animal Behavior
Episode overview
Why do animals do what they do? It’s a huge question, and in this episode, we’ll learn how scientists break it down. We’ll talk about the proximate and ultimate studies they use to .. show full overview
2x50
The Dr. Sammy Show
Episode overview
Biology connects all of life—all of YOUR life. In the final episode of Crash Course Biology, Dr. Sammy is taking your questions. No matter how big, small, or personal, biology is in them .. show full overview

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