Scientist believe that for more than 3 billion years, Earth's terrestrial surface was lifeless. Plant Life evolved in the seas from algae. Microbiologists have discovered 3 different types of algae (all apart of Kingdom Protista) that are credited as earths first "plants." The first is Brown Algae which is located in phylum heterokonitophyta. This type of algae is normally found in marine and temperate waters. Examples of some Brown Algae you might find are kelp, fucales, or dictyotales. The second is Red Algae which is found in phylum rhodophyta. These types of algae are most common in warmer, tropical waters and in temperate zones, found in deeper waters. Coralline Algae and Rhodophyceae are some example of Red Algae you might find. Last but not least, the Green Algae, a very diverse group located in phylum chlorophyta. The Green Algae species includes 3 forms: unicellular, colonial and multicellular. All forms are not to picky over where they live, as you can find them in all environments like fresh water, salt water or soil (land) The Unicellular Green Algae are very common in fresh water as part of Phytoplankton. An example of this species are Chlamydomonas. Colonial Green Algae live in long filaments or as colonial spheres. Examples of this species would be Spirogyra or Volvox. Multicellular Green Algae are mostly marine and are said to be ancestors of land plants. Sea Lettuce or Ulva are both examples of Green Algae.
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