As knowledge grew and the art of writing developed, parts of the story were recorded - some in one
book, some in another. No man could remember all there was to know and writers found it useful to classify their arranges its books in sections so that the reader will know where to look for each subject. Science became separated into various branches such as physics (the study of natural forces), chemistry (the study of materials), and biology, for example, was for many thousands of years simply the accumulation of man's experiences in the rearing of animals and the sowing and reaping of crops, while human biology was left to the witch- doctor, until the practice of medicine became well established.
Yet, time after time, one branch of science received new and exciting ideas from another which enabled it to make further progress. As knowledge in each subject grew, the subjects themselves began to overlap, producing new branches of science such as physical chemistry and bio-physics. Some men used this knowledge to build better machines and structures and later found it necessary to form special branches of what is called applied science. These engineers were the founders of civil, structural, mechanical and electrical engineering societies in many different countries.
If you want to know how to grow some crops,
you will find the books in the section of _________ .
biography
biology
chemistry
geography