stages in the evolution of living things

Events

multicellular cells

500 - 1000

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

colonial cells

1000 - 1500

groups of similar cells

eucaryotic cells

1500 - 2000

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

procaryotic autotrophic cells

2000 - 2500

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

procaryotic heterotrophic cells

2500 - 3500

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

membranes

3500 - 4000

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.

organic molecule

4500

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