Precamerbain Time.photosynthetic forms start to form.
add oxygen to the atmosphere.
examlpe >> Algae
1. Ordavovician and silurian period
2. Devonian period
3. Carboniferuos and Permain period
Ordavivian and silurian periodFirst land plant evolved from aquatic ancesetors.
* Grew close to the ground in damp areas
Devonian PeriodSome plants like ferns evovled.
adapted to dry places
Carboniferous and Permain PeriodGiant Ferns and other plants formed vast swampy forests.
Triassic PEriodCone-bearing Plants called Cycads
Cretaceous PeriodLeafy trees
Small Flowing Plants
Tertiary PeriodGrass and flowering plants evloved
Quaternary PeriodAfter Ie age period
water level is high and ther is more algae then any other plants through all the periods.
most l=plants are still there that survived the ice age.