definitions

• Cell:

  the smallest basic unit of an animal or plant; it’s microscopic and acts as a building block
• organelle:

  a subcellular structure that has one or more specific job(s) to perform in the cell
• organ:

  a structure made up of a group of tissues working together to perform a specific function
• organ system:

  a group of organs with related functions working together to perform a body function
• organism:

  a living thing that has an organised structure, can react to stimuli, reproduce, grow, adapt and maintain homeostasis
• tissue:

  a group of cells with similar structures working together to perform a shared function
• binarry fission:

  happens inside an individual bacterium, the DNA replicates, then the cell divides into two, with each daughter cell containing a copy of the parental DNA