PBS
Pbs Learning Media: Atmospheric Pressure
Did you know that air has weight? This illustrated essay from the NOVA Web site explores conditions that affect air density and atmospheric pressure.
PBS
Pbs Learning Media: What Killed the Dinosaurs?
This Evolution Web feature explores how evidence can support a variety of hypotheses surrounding the mystery behind the extinction of the dinosaurs.
PBS
Pbs Learning Media: Electron Transport Chain
This illustration from Biology by Kenneth R. Miller and Joseph Levine describes the steps of the electron transport chain, the second stage in the process of cellular respiration.
PBS
Pbs Learning Media: Mitochondria
Often referred to as the powerhouses of the cell, mitochondria provide the energy that powers nearly every cellular process. This essay by university lecturer John Ross describes in detail the structures and functions of these amazing...
PBS
Pbs Learning Media: Bird Food and Bird Beaks
There are almost as many types of bird beaks as there are types of food that birds like to eat. This collection of images shows a wide range of beaks and the types of foods handled by each.
PBS
Pbs Learning Media: Colorful Creatures
For animals, bright, flashy coloration can serve as a warning or as an invitation. Either way, colorful skin, feathers, and scales yell, "Notice me!" This collection of images shows examples of some of the world's most colorful creatures.
PBS
Pbs Learning Media: Creepy Crawlies
This interactive feature from the NOVA: "Odyssey of Life" Web site explores the often unwitting relationship we share with the billions of "creepy crawlies" that reside in our bodies and in our homes.
PBS
Pbs Learning Media: Living and Nonliving
What is it that distinguishes a living organism from a nonliving object? This collection of images presents examples that aren't as clear-cut as one might think, enticing students to question the meaning of life.
PBS
Pbs Learning Media: Duckweed
These images of duckweed (Lemna spp.) illustrate the basic anatomy and environment of these fast-growing plants.
PBS
Pbs Learning Media: What's Up With the Weather: Graphs
Examine this graph from FRONTLINE/NOVA: "What's Up with the Weather?" Web site to see dramatic increases in three greenhouse gases over the last two hundred years.
PBS
Pbs Learning Media: Chris Schneider: Rethinking Conservation
In this interview filmed for Evolution: "Darwin's Dangerous Idea," biologist Chris Schneider discusses the relationship between conservation and speciation.
PBS
Pbs Learning Media: Allopatric Speciation
These images from the Smithsonian Institution depict Nancy Knowlton's work with snapping shrimp in Panama. Knowlton found that the closing of the isthmus -- dividing the Pacific Ocean from the Caribbean -- resulted in new species of shrimp.
PBS
Pbs Learning Media: Complex Relations
In this text excerpted from Chapter 3, "Struggle for Existence," of Charles Darwin's "On the Origin of Species," Darwin draws on firsthand and historical information for his observations about evolution.
PBS
Pbs Learning Media: Convergence: Marsupials and Placentals
This graphic illustrates some of the marsupial mammals in Australia and placental mammals in North America. Even though they are not closely related, these mammals look alike because they have adapted to similar ecological roles. From...
PBS
Pbs Learning Media: Darwin's Diary
At the online companion Web site of "Evolution," the seven-episode series on PBS, delve into the private thoughts of a reluctant revolutionary--Charles Darwin.
PBS
Pbs Learning Media: Darwin's Letters: Collecting Evidence
This group of letters is a sample of the extensive correspondence Darwin carried on with a wide group of friends and colleagues as he collected evidence to support his theory of evolution by natural selection. From Charles Darwin's...
PBS
Pbs Learning Media: Darwin's Letters to Lyell
In this letter written to his friend and mentor Charles Lyell less than three weeks after the publication of "On the Origin of Species", Darwin describes the reaction of the great anatomist Richard Owen to his theory. From Charles...
PBS
Pbs Learning Media: Evolution on Double Time
In this excerpt from the PBS series "Evolution," award-winning science journalist Carl Zimmer describes how gene duplication may have been the key to the rapid evolution of the early stages of life on Earth.
PBS
Pbs Learning Media: Evidence for Evolution Web Quest
This Web quest from the PBS series "Evolution" will help you investigate a variety of types of evidence for evolution.
PBS
Pbs Learning Media: Life's Grand Design
Are nature's complex forms evidence of "intelligent design"? In this Evolution essay, biologist Kenneth Miller explains how the processes of evolution account for complex structures such as the human eye.
PBS
Pbs Learning Media: Hummingbird Species in the Transitional Zones
This video segment from Evolution: "Darwin's Dangerous Idea" shows biologists Chris Schneider and Tom Smith studying hummingbirds and other animals in Ecuador. Their research is investigating the processes by which new species are formed.
PBS
Pbs Learning Media: Laetoli Footprints
This Evolution video segment describes how the famous track fossils known as the Laetoli footprints might have been formed and what they can reveal about the creatures who left them.
PBS
Pbs Learning Media: Molecular Clocks: Proteins That Evolve at Different Rates
In this graphic and article from "The Human Evolution Coloring Book" by Adrienne Zihlman, four different proteins from humans and horses are compared and the reasons each protein evolves at its own characteristic rate are discussed.
PBS
Pbs Learning Media: Sweaty T Shirts and Human Mate Choice
This video segment from Evolution: "Why Sex?" explores the "sweaty T-shirt experiment," which showed that humans may unconsciously be drawn toward a specific kind of genetic variation in a mate.