Join the Amoeba Sisters in this longer review video as they review food chains, food webs, how energy flows through trophic levels (including the 10% rule), ecological relationships (including parasitism, mutualism, and commensalism),...

Join the Amoeba Sisters as they take a brisk "stroll" through their biology playlist! This review video can refresh your memory of major concepts, help you identify what you need to re-study, and reinforce vocab. Expand these details for...

Explore biomagnification which can happen when toxins become more highly concentrated when moving up through trophic levels in the food chain. Uncontrolled use of DDT is used in video as an example. Learn why bioaccumulation can occur in...

Hank brings us to the next level of ecological study with ecosystem ecology, which looks at how energy, nutrients, and materials are getting shuffled around within an ecosystem (a collection of living and nonliving things interacting in...

Any organism that gets its energy by consuming other organisms.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science...

A journey through a marine food chain, from tiny plankton to the ocean's giants. Biology - Ecosystems - Learning Points. Phytoplankton are the basis of the oceanic food chain. In the Pacific Ocean, millions of herring feed on these...

How energy is passed through living things can be described as a food chain. Journey through a food chain, from primary producers at the bottom to tertiary consumers at the top. Biology - Ecosystems - Learning Points. A 'food chain'...

Four Arctic animals are shown, but which is the odd one out?
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Life processes - Living things in their environments


- Food chains


A Twig Tidbit Film - Odd one out. The children have to work out which...

Now that we know about nutrient cycling, we are ready to look at food webs as a whole. These represent feeding relationships within a community.These relationships designate certain trophic levels, so let's learn about what these mean...

This video covers:

- The idea that trophic levels are just the different levels of a food
chain
- Trophic level 1 are called the
producers
- Trophic level 2 are primary consumers, trophic level 3 are called the...

The video “Energy in an Ecosystem” discusses the complex relationship between organisms in an ecosystem, focusing on how small changes can have a large impact.

The video discusses the concept of a community in an ecosystem and the levels of organization within it. It covers the role of photosynthetic organisms in producing biomass, the different types of consumers (primary, secondary, and...

In this section, I talk about the sun as a source of energy, consumers vs. producers and cycles found in nature

In this video, we learn about the components of an ecosystem, including biotic (living) and abiotic (non-living) factors. We also learn about the different types of biotic components, including producers, consumers, and decomposers.

The video discusses the important ecological concepts of trophic levels and biomass. The video provides an example of a food chain, from grass plants as producers to apex predators that have no predators of their own. The video explains...

How do we find out the position that an organism occupies in a food chain? The different feeding positions in a food chain or web are called trophic levels. All food chains and webs have at least two trophic levels, starting at level one...

It explains the unidirectional flow of energy through different trophic levels; energy flow maintained by laws of thermodynamics, food web, food chain and the ten percent law.

Learn all about ecological pyramids and how to show quantitative data about relationships between species.