• Animals are multicellular eukaryotes that lack cell walls.
  • This gives animal cells flexibility.
  • It lets them take on different shapes so they can become specialized to do particular jobs.
  • The shape of an animal cell is not constrained by a rigid cell wall.
  • Most animals share these characteristics: sensory organs, movement, and internal digestion.
  • All of them are illustrated in Figure below.
  • All animals are heterotrophs.
  • They have sensory organs and the ability to move.
  • They also have sexual reproduction.
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