As I was writing a post when I remembered a book I had as a child. It was about natural history and it would have been an old hardback I think. If I remember correctly, it had 4 or 5 chapters. They seemed to increase in stages of difficulty. And if my memory serves me right, the last chapter was printed on yellow-coloured pages and dealt with things like genetics. I was far too young to understand that chapter and never read it.
Does anyone remember this book? Can anyone give me a clue to what its title might have been?