Learn about the many types of interspecific interactions: competition, predation, herbivory, symbiosis, parasitism, mutualism, commensalism. [8:11]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

This video explores what happens when exotic animal and plant species are introduced into ecosystems, and the impact of introduced species on biodiversity. [9:56]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Learn the difference between density-dependent and density-independent factors that affect population growth, and explore examples of each. [10:38]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

What effect do interactions between species have on the sizes of the populations involved? Learn about the dynamics of predator and prey populations, and how they can influence one another's patterns of growth and decline. [5:08]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

How the sun's energy drives the water cycle on Earth. [8:13]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Ecosystems are composed of all interacting organisms (biota) along with their physical and chemical environments. Physical aspects of an ecosystem, called abiotic components, include variables related to temperature, sunlight, soil, and other factors. [33:28]

Slideshow that looks at energy flow in an ecosystem. Explains what an ecosystem is, how energy flows through it, the producers and consumers of energy, and food chains. Links to a video about plastic debris in the ocean.

Perform oblique releases and observe the horizontal range and the maximum height of the projectile.

This is a simple quiz on the morphology of the brain of different animals.

This is a virtual laboratory to determine the static and dynamic coefficients of friction.

Expand your knowledge of Chemistry. Observe how ionic compounds are networks of electrically charged atoms.

This site shows a cinematic study of rectilinear movements which requires the use of equations and graphs. Every day life applications are also shown.

Cross different types of peas and study the phenotype and the genotype of the offspring.

What determines the period of oscillation of a pendulum? Try this little demonstration to find out the answer.

This is a short demonstration to learn about the different types of forces.