BIO 100 Lecture Notes - Lecture 3: Eukaryote, Archaea, Plant
15 Aug 2017
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All known life forms belong to one of these categories. The domain eukarya in turn includes three smaller divisions called kingdoms: Most members of these three kingdoms are multicellular. These three multicellular kingdoms are distinguished partly by how the organisms obtain food: Plants produce their own sugars and other foods by photosynthesis. Fungi are mostly decomposers, digesting dead organisms and organic wasters. Animals obtain food by ingesting (eating) and digesting other organisms. Those eukaryotes that do not fall into any of the three kingdoms fall into a catch-all group called the protists. Most protists are single-celled; they include microscopic organisms such as amoebas. But protists also include certain multicellular forms such as seaweeds. Scientists are in the process of organizing protists into multiple kingdoms, although they do not yet agree on exactly how to do this. Biology is based on two main facs. Life is subject to physical and chemical processes. All known biological processes are a result of evolution.
