A2.2.7

• homeostasis - maintenance of a constant internal environment in an organism
• metabolism - the sum of all the biochemical reactions that occur in a living organism
• nutrition - supplying the nutrients required for energy growth and repair in an organism
• excretion - removal of waste products of metabolism from an organism
• growth - an increase in size or number of cells
• response to stimuli - perception of stimuli and carrying out appropriate actions in response
• reproduction - production of offspring (sexually or asexually)
• In multicellular organisms different cells carry out these processes of life, however in unicellular organisms one cell must carry out all. Examples: Paramecium, Chlamydomonas
• Paramecium must carry out all on their own.

  
• Chlamydomonas: must perform all processes of life.