• All living organisms, from the smallest bacterium to the largest whale, share certain characteristics of life.
  • Without these characteristics, there is no life.
  • To be classified as a living thing, an object must have all six of the following characteristics: It responds to the environment.
  • It grows and develops.
  • It produces offspring.
  • It has complex chemistry.
  • A cell is the basic unit of the structure and function of living things.
  • All forms of life are built of cells.
  • Living things may appear very different from one another on the outside, but their cells are very similar.
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