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The balance of nature is a major force in the survival of man ... [DDT manufacturers] seem to think that the balance of nature has been repealed. You might as well try to repeal the law of gravity
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5 Oct 2026
Richard Scarr
It is with great sadness that we have to announce the passing of Richard Scarr. He was always an enthusiastic biologist and a dedicated educator. After reading Biology at Kings College in London he taught...
12 Aug 2026
Exam practice questions
Over the summer we have completed a full set of exam practice question pages, one for each topic. These pages are great for homework or revision. The Exam practice concept; The pages all have “exam practice”...
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Subscriber comments
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It was so easy for me to assign the Test from the Task manager. now I need to download the test and give it to them
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Sustainability -
Very sad news.
Richard Scarr
Elizabeth
Could you please check the cladograms at the bottom of the first page of the "Using DNA sequences to build cladograms" worksheet? The first and third cladograms are the same. I think B and A need to be swapped in the third one.
Reclassifying using DNA, cladistics & rRNA (2025)