The Physiological Tolerance of Two Species of Protozoans

College-level or AP chemists use phthalic anhydride to synthesize two different polyesters, one linear and one cross-linked in structure. A detailed materials list and well-written procedures are provided on a lab sheet. Learners write...

Advanced chemistry classes compare the polymerization of styrene using two different initators: benzoyl peroxide and aluminum chloride. Once they synthesize polystyrene, they compare the two producet for melting point and density. There...

What creatures lurk in the rainforest at night? Meet three of them in one short video. Part of a playlist exploring mammals, the video presents a look at night research in the Amazon. Scientists locate and photograph two bat species and...

How is it that the same animal, living in the same place, at the same time, evolved into two different species? As part of a larger series, an engaging video explains the rise of the chalicothere, the split in evolution, and eventually...

How are living organisms grouped? In this eight-minute video clip, the system of grouping them according to similarities and relationships is broken down in a simple and straightforward manner. Sal explains the definition of species and...

Students discover that proteins that are the product of DNA translation are different for different species. They determine that by analyzing their mass and charge they can differentiate between two different species. They use some of...

2004 and 2012 record two massive earthquakes in the same general geographic area occurred. Find out why the outcomes of both were so different. [4:38]

A documentary film about the horseshoe crab and its importance to a tiny shorebird known as the red knot bird. Human threats to the crab will directly threaten both the crab and the little bird who depends on it. Links to related topics...

In this two-mirror worksheet, students answer 3 questions about 3 different diagrams that show two-mirrors. They identify the rays used to see the images, and they distinguish the rays that bring color to the top of the eye and the...

Different islands in the Caribbean have very similar species of anole lizards, which each have their own place in the ecosystem. Researchers did several studies to determine whether the anoles evolved into the different species then...