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 within a single generation. Along the way, we’ll...

Charles Darwin encountered a tiny fox-like creature during his famous voyage but instead of discovering its fascinating evolutionary story, he just knocked it on the head with his geology hammer.

Paul Andersen reviews the major concepts within the second unit of the new AP Biology framework. He starts by describing how life is organized into three domains. He explains how the history of life on the planet is...

Scientists have used a bacteria that commonly infects us to track how ancient humans spread to the Americas from Siberia. And other scientists have discovered a new species of hyrax in the forests of Africa by listening to their barks...

When a group of apes got split apart, slight differences in their new environments led to big differences in future generations.

Even though less than 1% of Earth's water is freshwater, it's the home for 50% of fish species. This is the Freshwater Paradox.

Hank talks about ancient sexy times, and how we know that early humans were getting it on with all kinds of folks.

Explore speciation with The Amoeba Sisters. This video discusses sympatric and allopatric speciation and covers several types of isolation types including behavioral, temporal, and habitat isolations. Table of Contents: Intro 00:00...

Paul Andersen details the evolutionary processes of speciation and extinction. Stickleback evolution in Lake Loberg is used as example of rapid speciation. Adaptive radiation is illustrated using the Hawaiian honeycreeper. A brief...

Hank explains speciation - the evolutionary process by which new biological species arise - in terms of finches, ligers, mules, and dogs.

Paul Andersen explains how reproductive isolation can eventually lead to speciation. Three main barriers to gene flow are included: geographic, pre-zygotic and post-zygotic. Both allopatric and sympatric speciation are discussed. A...

How does one species evolve into two within the same habitat? Discover the details behind a rare type of evolution: sympatric evolution.

Paul Andersen discusses the specifics of phylogenetics. The evolutionary relationships of organisms are discovered through both morphological and molecular data. A specific type of phylogenetic tree, the cladogram, is also covered.

In this video Paul Andersen explains how biodiversity can be measured through genetic, species, or ecosystem variety on the planet. Species diversity is increased through speciation and decrease through extinction. The mechanism for...

A species is a group of closely related organisms capable of interbreeding and producing fertile offspring, and speciation is the evolutionary process by which new species arise. Speciation can occur through anagenesis (gradual...

Evolution is the net change in organisms or a population over the span of many generations. This change in organisms or populations happens through DNA mutations and reconbination and is passed down to the next generation through...

How are new species created? An insight into the key evolutionary processes, played out over many generations, which lead to speciation. Biology - Adaptation And Evolution - Learning Points. We all originate from a single cell, so why...

Adaptations are the ways in which organisms change over time in response to the changing demands of their environment. Through adaptation, organisms can develop certain physiological, behavioral, and structural traits gradually to...

The theory of evolution by natural selection is the process through which organisms change over time as a result of changes in physical or behavioural traits. These changes will allow an organism to adapt better to its environment and...

Brit looks back on our sixth month on Nature League, when we explored the theme of evolution and speciation. Get your Nature League pin here!

In this De-Natured segment of Nature League, Brit breaks down a recent scientific journal article about the rates of speciation of marine fish around the world. Article citation: Rabosky, D.L., Chang, J., Title, P.O., Cowman, P.F.,...

This video introduces the concept of speciation and the role of Darwin's finches in understanding evolution. It explains how these birds, with their distinct species, provide evidence for the theory of natural selection and evolution....

The video discusses the contribution of Alfred Russell Wallace to the theory of evolution. The video highlights Wallace's discoveries related to the use of color by some plants and animals, which he suggested evolved by natural selection...

In this Nature League Field Trip, Brit joins scientists in the Flathead River system to explore the consequences of genetic introgression between westslope cutthroat trout and rainbow trout.