Communities are dynamic and change over time, and we can observe this process with particular clarity after a disturbance or on new land. Learn about primary and secondary succession, as well as pioneer species. [4:39]

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.

Are all coral reefs the same? Each regional ecosystem has its own assemblage of species and each contributes uniquely to global biodiversity. Explore why ecosystem diversity is important for conservation decisions. [4:13]

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.

An introduction to ecosystems with how land ecosystems are classified into biomes. [7:32]

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.

Understand the flow of energy and matter through ecosystems and what happens if an ecosystem is disrupted. [8:56]

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.

Seeing how energy and matter flows and is recycled from primary producers (autotrophs) to primary, secondary and tertiary consumers. [10:25]

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 about effects of climate change on biodiversity. [12:07]

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 about the human activities that cause a loss of biodiversity. [12:51]

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 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.

Economics website presents a video [0:52] and quiz teaching students about the concept of money and monetary goods.

This video teaches the concept of Scarcity and includes a quiz. The total resources of society, including natural resources, human resources, capital goods and entrepreneurship, are limited, causing scarcity to exist. [1:13]

Our standard of living depends on the pace of economic growth. That pace can be enhanced through increased productivity brought about by investment in physical and human capital and advances in technology. In this module, students will learn about these tools to increase productivity and advance our standard of living. This content from Econ Lowdown also features alignment to national Financial Literacy and/or Economics standards.

In this interactive lesson, students analyze economic data to better understand America's middle class, its role in the economy, and its impact on economic growth.

In this free tutorial, learn all about using and customizing Edge for a better browser experience.

Lessons include: (1) Getting Started with Edge. Learn all about getting started with Microsoft Edge as your web browser. (2) Browsing in Edge. Learn how to browser in Microsoft Edge. (3) Customizing Edge. Learn how to customize Microsoft Edge. (4) Adding and Managing Favorites. Learn how to add and manage favorites in Microsoft Edge. (5) Privacy and Security in Edge. Learn all about privacy and security in Microsoft Edge.

Edit your resume to make it stronger and more appealing to an employer. Time to complete: 45-90 minutes

What can be done to get people back to work? Students get the answer to this and other questions — including why education might be the best way to avoid unemployment in the future — in this short online module. This content from Econ Lowdown also features alignment to national Financial Literacy and/or Economics standards.

How can you implement effective decoding instruction for diverse learners in your classroom? This site focuses on phonemic awareness, alphabetic principle, morphology, and the six basic types of syllables in the English language.