Everyone knows the smallest chips settle to the bottom of the bag, but why? An episode from a series of science videos describes the percolation effect using both demonstrations and animation. Scholars watch as smaller particles fill...

Freshwater fish pee almost constantly, while saltwater fish pee very little. Scholars investigate the concept of homeostasis with a video lesson comparing fresh and saltwater fish. An episode describes how some fish absorb water, while...

Our brains may misrepresent features that make some faces look more alike than they actually are. Learners watch a video lesson that breaks down how the brain reads facial features and how those features themselves are not as important...

Not all hearts are the same, but their functions are similar. An instructor discusses the origin of the first organisms with a heart in a video lesson from the PBS Eons series. The lesson includes discussion of the evolution of the...

We've heard about pygmy pigs—why not pygmy mammoths? Fossil evidence proves their existence, but the dilemma is figuring out where they lived. A video describes different theories on their evolution and migration.

You may struggle to find similarities between humans and many of our ancestors. Fossil evidence finds more and more signs of similarities between humans and many other species. A lesson outlines the fossil evidence and the questions...

Pollution is a real concern in most areas of Earth. A four-question AP® assessment has learners analyze data related to water pollution and air pollution as well as consider the pros and cons of recycling. Each question has several...

Practice makes perfect! A released AP® exam gives scholars practice with the high level of expectations of their exams. The exam consists of four questions from 2000. Questions ask about endangered species, recycling, alternative fuels,...

Water quality testing often reveals interesting facts about the local environment. Scholars respond to several AP® questions highlighting topics such as air pollution, water pollution, and the spread of disease. Each question requires a...

One size fits all doesn't seem to be the right approach to endangered species. Using a four-part AP® assessment, learners respond to questions that address environmental concerns such as human population changes, invasive species...

Can the increase in meat production keep pace with the increase in population? Individuals analyze data to determine when human populations will exceed meat production at the current rates of increase. They also consider infectious...

There is a strong correlation between the carbon dioxide concentration in the air temperature. Scholars offer explanations for the correlation in one of four AP® free-response assessment questions. Their analyses in the other questions...

Some of the oiliest creatures on earth may be the answer to our energy crisis! Using a four-question assessment, resource scholars consider the use of microalgae as fuel among other environmental science topics. Each question has several...

Beetle population, climate change, and acidification are all real environmental threats. Scholars display their knowledge of these threats and offer solution strategies in a four-question assessment resource. Questions from the AP® exam...

Sometimes solving one problem leads to another. Scholars respond to questions about fracking to harvest natural gas and other environmental related topics. The resource provides items released from the 2012 AP® Environmental Science exam...

Small but fierce! The tardigrades are less than a millimeter long but can survive extreme cold, extreme heat, and even being in a vacuum. A video presentation explains the unique protein these organisms use to withstand extreme situations.