stages in the evolution of living things

represents the most advanced form of life
groups of cells with differing functions from each other

groups of similar cells

first cells with nucleus
cells with membrane bound organelles
Prokaryotic cells engulfed other cells which became the organelles

heterotrophic cells developed pigment
pigment allowed to to create there own food

no membrane bound nucleus and organelles
the consume organic molecules to gain food

This separated a group of molecules from the external environment, providing protection and the ability to maintain itself as a separate entity, for example liposomes.

This stage is important because all living things are composed of complex organic molecules, for example amino acids.