Biology is usually divided into Plant Biology or Botany, Animal Biology or Zoology. Howeve all and re similar in organisms, both p nts and animals, ral important ways. For example, each kind of organism has its Sever own shape, or morphology Plant Morphology and Animal Mom particular phology are therefore the branches of Botany and of Zoology in which we study the external shape of plants and of animals An organism also has a particular internal structure which is more or les different from the internal structure of all other kinds of organisms This is studied in either Plant or Animal Anatomy. We also want to know about a the different chemical activities that take place in an organism, and the study of the chemistry of drganisms is called Physiolo Before organisms die they usually produce offspring. The name of the process of producing offspring is reproduction, and we call the study of the process Reproduction as ell. The offspring produced can be seen to mble their parents in some ways and to differ from them in other ways Genetics is the study of the reasons for such similarities and differences. The process that takes place when an egg develops into an adult is studied in a separate branch of study called Embryology. Most biologists believe that after long periods of time the descendants of group of reproducing organisms can beeome very different from their anc tors. The study of how and why groups of organisms change, or evolve, called Evolution. On the basis of an organism's olutionary history, and in erms of its morphology and anatomy, we try to classify it. The name of this study is Taxonomy Organisms respond to changes such as t ning of darkness in the evening, and they react to dangers and events, The study of what organisms do in particular situations is known as Behaviour. We also want to know about the relationships between different organisms and between an organ and the non-living, physical world that it lives in. For example, we want ism at particular plants and why a plant can grow in one to know which anim place but not in another. The study of duestions such as these is called Ecolog.