food contains nutrients for living things & nutrients are a source of energy for living things -> poison is a sink of matter for inanimate nothing food is a source of energy for living things  poison is a sink of matter for inanimate nothing & a living thing requires energy to grow and heal -> a living thing requires food to get energy to grow and heal a living thing requires food to get energy to grow and heal  a living thing requires food to get energy to grow and heal & inanimate nothing eat their poison sink -> eating food is used to get energy by living things