1. Levels of Organisation (from Year 9)
CELLS are the smallest structural and
functional unit of every organism.
Groups of cells with similar structures,
performing a shared function form a TISSUE.
An ORGAN is a structure made up of a group
of tissues, working together to perform a
specific function.
Several organs with related functions working
together to perform a body function form an
ORGAN SYSTEM.
Groups of organs systems together make up
an ORGANISM.