The Three Levels of Biodiversity

This interactive adapted from Kentucky's Natural Heritage: An Illustrated Guide to Biodiversity, introduces learners to the three levels of biodiversity: genetic, species, and ecosystem.

Think Garden: Plant Families

This video breaks down the scientific classification of living organisms. Learn about the order of classification: kingdom, phylum, class, order, family, genus, and species. Also get a closer look at some specific plant families to find out which fruits and vegetables are in the same family.

Think Garden: Plant Structure

This video examines plant structure by taking a closer look at the root and shoot systems. Learn about roots, stems, leaves, flowers, seeds, and fruit through engaging illustrations and animations.

The Advantage of Sex

Why did sex evolve? The likely answers, in this essay for the Evolution Web site by science journalist Matt Ridley, may surprise you.

Albino Redwoods: Ghosts of the Forest

Pale ghosts that hide amid their gigantic siblings, only a few dozen albino redwood trees are known to exist. In this video from QUEST produced by KQED, track down these elusive phantoms of the forest.

Albino Redwoods: Ghosts of the Forest Audio

Park rangers in the Santa Cruz Mountains are protecting a decades-old secret: albino redwood trees. In this audio report from QUEST produced by KQED, learn about these so-called "ghost trees."

All in the Family

This video from the series Faces of America details the process of documenting family history and tracing lineage back through maternal and paternal lines.

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All in the Family

In this Evolution Web feature, test your skills at judging who's who on the tree of life while you learn about the tools and methods of cladistics.

Alzheimer's: Is the Cure in the Genes?

An estimated 15 million Americans will suffer from Alzheimer’s by 2050. QUEST visits with researchers at San Francisco’s Gladstone Institutes who have found that a gene may hold the key to a cure for this debilitating affliction.

Alzheimer's Disease

This video segment from the Secret of Life School Video: "Genetic Medicine: Tinkering with Our Genes" explores the potential for gene therapy to cure diseases like Alzheimer's.

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American Chestnut Tree

This annotated slideshow adapted from KET's Electronic Field Trip to the Forest illustrates how blight decimated the American chestnut tree and the methods scientists use to identify and pollinate the remaining trees to create blight-resistant trees.

Animal Babies

This interactive slide show illustrates the variety of animal babies that exist on earth -- some completely independent and others deeply reliant on parental care.

Animal Body Plans: Homeobox Genes

The homeobox genes that define the basic body plan of mice and fruit flies are illustrated in this graphic from The Human Evolution Coloring Book by Adrienne Zihlman. The accompanying article describes how these genes act as "molecular architects" in all animal species.

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Animal Cloning 101

Learn about clones and explore the methods scientists use to create clones in the lab in this interactive activity from the Dolan DNA Learning Center.

Animal Coverings

It takes a thick skin to withstand the hardships that life has to offer. This collection of images shows a variety of animals, each with a slightly different type of protective covering.

Animal Families

How long does a baby elephant stay with her mother? What do you call a baby goat? Young children learn some interesting facts about the lives of baby animals in this original video from KET.

Asexual Reproducers

This video segment explores the benefits and pitfalls of cloning as a means of reproduction. From Evolution: "Why Sex?"

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As the Crow Flies

In this video from Nature researchers from the University of Washington conduct a long-term experiment to see if crows can pass information down from one generation to the next.

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Asthma: What Brought on the Epidemic?

In this video from QUEST produced by KQED, learn about research that is being done into the possible environmental and social culprits of childhood asthma that could one day lead to measures that prevent kids from developing the disease.

Becoming a Mosquito

Join students as they observe mosquitoes in different stages of development and learn about the insect's life cycle in this video from Curious George.

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