Biology is the study of living things. All living things are called organisms, both plants and animals are living organisms. But how we decide whether something is living or non-living depends on 7 life processes, There are seven life processes that tell us that animals are alive. To help us remember them we have found a friend to remind you - Mrs Nerg. Although her name sounds a bit strange, the letters in it stand for the life processes - movement, reproduction, sensitivity, nutrition, excretion, respiration and growth.