IGCSE Biology 0610

1.1 Characteristics of living organisms

We can use the acronym MRS GREN

  • Movement – an action by an organism or part of an organism causing a change of position or place
  • Respiration – the chemical reactions in cells that break down nutrient molecules and release energy for metabolism
  • Sensitivity – the ability to detect and respond to changes in the internal or external environment
  • Growth – a permanent increase in size and dry mass
  • Reproduction – the processes that make more of the same kind of organism
  • Excretion – the removal of the waste products of metabolism and substances in excess of requirements
  • Nutrition – the taking in of materials for energy, growth and development

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