The concept of competitive exclusion, explained here, states that two species cannot co-exist when needing the same, limited resources to survive. The different types are described and examples are provided.

This interactive assessment features 7 matching, 7 multiple-choice, and 6 true/false questions over the 99 vocabulary words.

[Free Registration/Login may be required to access all resource tools.] Predation is another mechanism in which species interact with each other. Predation is when a predator organism feeds on another living organism or organisms, known...

In this lesson you will learn to understand better the different plants in your environment, its characteristics and its presence in our daily lives. Learn how important the plants are for the survival of all ecosystems in the world and...

Throughout this unit, you will see how man change and affects the environment in which they live. You will have a better understanding of our need of matter and energy and the consequences of their use and abuse. It contains 19...

Take this interactive, multiple-choice quiz over concepts in ecology, then review your score and any missed questions at the end.

[Free Registration/Login may be required to access all resource tools.] Ecology is the study of how living organisms interact with each other and with their environment. Organisms interact with each other through various mechanisms, one...

Students are introduced to the classification of animals and animal interactions. Students also learn why engineers need to know about animals and how they use that knowledge to design technologies that help other animals and/or humans....

Join Ellen on her trip to the Kaap De Goede Hoop in South Africa, and learn more about plants, animals, and energy.

Explore biotic and abiotic factors that can influence the growth of populations of organisms in this interactive tutorial.

Selected (8) reading passages (grades 6-10) to pair with "World Without Fish" by Mark Kurlansky. Mark Kurlansky discusses how humans treat the oceans and the fish that live in them, and what the world will likely look like if fish...

Explore the rich habitats and natural beauty of the California landscape in this interactive video.

In this interactive learning module, students discover the effects of the changing tides on the life and health of an estuary ecosystem.

Shiretoko Peninsula is located in the north-east of Hokkaido, the northernmost island of Japan. The site includes the land from the central part of the peninsula to its tip (Shiretoko Cape) and the surrounding marine area. It provides an...

Cocos Island National Park, located 550 km off the Pacific coast of Costa Rica, is the only island in the tropical eastern Pacific with a tropical rainforest. Its position as the first point of contact with the northern equatorial...

Ibiza provides an excellent example of the interaction between the marine and coastal ecosystems. The dense prairies of oceanic Posidonia (seagrass), an important endemic species found only in the Mediterranean basin, contain and support...

Plants represent the most important and basic step of any ecosystem. Learn more about this topic in this unit. It includes 15 interactive activiti

Comprehensive reference material on the American bison: its habitat, physical features, eating habits, reproduction, behavior, communication, roles in a prairie ecosystem, and interactions with humans.