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Food webs are models that demonstrate how matter and energy is transferred between producers, consumers, and decomposers as the three groups interact within an ecosystem. Transfers of matter into and out of the physical environment occur at every level. Decomposers recycle nutrients from dead plant or animal matter back to the soil in terrestrial environments or to the water in aquatic environments. The atoms that make up the organisms in an ecosystem are cycled repeatedly between the living and nonliving parts of the ecosystem.

This video explores percentage changes.

According to Creative Commons there are over 1.6 billion openly licensed teaching and learning resources available on the internet. Open Educational Resources (OER) are quality, free educational resources, that you can use without having to ask for permission, and that can be adapted to better suit local contexts and needs.

Many educators and developers don't know how to efficiently search for and identity useful resources. Some throw up their hands in horror and give up when tasked with finding suitable resources on the Internet. In this tutorial, we are committed to providing you with a search strategy for open content to ensure that you quickly find open resources. Let us begin!

On completion of this unit of study you will be able to:

• Decipher open licenses i.e. identify rights and permissions contained within Creative Commons licences attached to open content.
• Search for open content using common tools and filters such as on Google Advanced Search and the YouTube Creative Commons filter, as well as specialized services such as Creative Commons Search to find open media.

Video 1: Finding percentages with a double number line
Video 2: Finding the whole with a tape diagram
Online activity: Find percents visually

We can analyse the arrows in a food web to identify producers, primary consumers, secondary consumers, and decomposers.

We can analyse the arrows in a food web to identify producers, primary consumers, secondary consumers, and decomposers.

Volgens Creative Commons zijn er meer dan 1,6 miljard open gelicentieerde onderwijs- en leermaterialen beschikbaar op het internet. Open Educational Resources (OER) zijn gratis onderwijsmaterialen van hoge kwaliteit die je kunt gebruiken zonder toestemming te hoeven vragen, en die kunnen worden aangepast om beter aan te sluiten bij lokale contexten en behoeften. 

Veel leerkrachten en ontwikkelaars weten niet hoe ze efficiënt bruikbare bronnen kunnen zoeken en identificeren. Sommigen gooien vol afschuw hun handen omhoog en geven het op wanneer ze geschikte bronnen op het internet moeten vinden. In deze handleiding willen we je een zoekstrategie geven voor open inhoud, zodat je snel open bronnen kunt vinden. Laten we beginnen!

Na afronding van deze studie-eenheid bent u in staat om

• Open licenties te ontcijferen, d.w.z. de rechten en toestemmingen te identificeren die zijn opgenomen in Creative Commons-licenties die aan open content zijn verbonden.
• Zoeken naar open materiaal met behulp van veelgebruikte tools en filters zoals Google Advanced Search en het Creative Commons-filter van YouTube, maar ook met gespecialiseerde diensten zoals Creative Commons Search om open media te vinden.