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I was a school teacher for 21 years now run an Education company from home. Some of my resources are for sale here.

I was a school teacher for 21 years now run an Education company from home. Some of my resources are for sale here.
iGCSE Biology
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iGCSE Biology

4 Resources
Several resources to help with iGCSE Biology including specifically DNA/inheritance
Chemical tests AQA GCSE 4.8
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Chemical tests AQA GCSE 4.8

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A powerpoint summarising the gas tests, flame tests, metal hydroxides, carbonates, sulfate and halides - 2 very good video links in the powerpoint.
Titrations
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Titrations

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Concise powerpoint defining titration, end-point, indicator, and including titration method, and explanation of which indicator to use with which substances
The Eye
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The Eye

(1)
powerpoint summarising Edexcel B textbook but can be adapted for any exam board
Errors and Uncertainties
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Errors and Uncertainties

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A powerpoint detailing what is meant by accuracy, precision, random, zero and systematic errors, and how to calculate uncertainties
Organisation of an Ecosystem
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Organisation of an Ecosystem

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A powerpoint suitable for use in all GCSE Biology courses, and can easily be adapted or added to as necessary. Includes food chains, trophic levels, Carbon cycle, decomposition and biomass pyramids.
AQA A level Biology Digestion
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AQA A level Biology Digestion

(0)
A powerpoint summarising everything you need to know about Digestion for the AQA A level Biology syllabus. I have included a video which keeps cotransport very simple.