Summary:
- 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.