There are three types of algae
Land plants developed from Green algae, over 450 million years ago. 500 mya plants evolved. Special adaptions had to be formed for life on dry land. Protection from drying out: desiccation (waxy cuticle) gas exchange through cuticle (stomata's) as well as protection for the embryo, seeds.
Belief land animals developed from algae:
- Plant life evolved in the seas from algae
- First photosynthetic organisms were aquatic green algae