&initialtitle=Life on Earth &initialdescription=The relative sequence of appearance of major groups of life &bacteriadomain=Current human understanding of life recognizes three major domains of life. These domains are larger units than phyla and reflect our recent ability to look at the details of smaller living things such as bacteria, particaulary their genetic material. &bacteriatitle=Bacteria &bacteriadescription=Single-celled oganisms whose genetic material is not contained in a nucleus. They rapidly pass genetic material to individuals that are not offspring, causing problems such as drug resistance. They can be manipulated to build nanomaterials. &archaeatitle=Archaea &archaeadescription=Single-celled organism whose genetic material is not contained in a nucleus. Thought to be bacteria until differences revealed by genetic analysis. Adapted to live in extreme environments. Opens possibility of life on other planets. &eukaryotatitle=Eukaryota &eukaryotadescription=Eukayotes include single-celled and multicellular organisms made up of cells that possess well-defined cell nuclei containing genetic material. &sourceText1=University of California Museum of Paleontology. &chromistatitle=Chromista &chromistadescription=Most single-celled, aquatic and photosynthestic. Tend to be brownish-yellow due to pigment chlorophyll-c. Includes diatoms,coccolithores, water molds and downy mildews (which are not fungi), and multicellular algae such as kelp. &plantaetitle=Plantae &plantaedescription=Most are multicellular and live on land. Make their own food by photosynthesis. Green-colored due to the presence of the pigment chlorphyll that absorbs sunlight. Play a crucial role in packing the Sun's energy into forms that can be used by animals. &fungititle=Fungi &fungidescription=Important organisms on land that help plants by breaking down organic material in soils around roots of plants. Fungi include yeasts, plant diseases such as rust and animal disease such as athlete's foot. Not significant in marine environment. &protistatitle=Protista &protistadescription=Aren't plant, animal, or fungus. Generally aquatic and single-celled. Includes marine sediment builders such as radiolarians and foraminifera (some would include diatoms and coccolithophorids). Likely to include unrelated organisms that will be reclassified. &metazoanstitle=Metazoan &metazoansdescription=Metazoans include most animals.They are mostly multicellular and cannot make their own food by photosynthesis. They appear in fossils of the Ediacaran or Vendian biota near the end of the Precambrian. &sourceText2=source 2 &chaetognathatitle=Chaetognatha &chaetognathadescription=Includes the most common predator in the oceans, the arrow worm. &arthropodatitle=Arthropoda &arthropodadescription=Includes animals related to insects, such as crabs, shrimp, lobsters, ... &miscwormstitle=Worms (misc.) &miscwormsdescription=There are many worm phyla,but understanding the difference sin these phyla doesn't contribute substantially in understanding fishes so we've lumped them here. &cnidariatitle=Cnidaria &cnidariadescription=Diverse group that includes corals, jellyfish, siphonophores, medusae, box jellies, and hydroids. All possesss stinging cells called nematocysts. Solitary and colonial forms. Some build reefs and have internal photosynthetic symbionts. &placazoatitle=Placozoa &placazoadescription=Tiny simple animals with no hard parts. Very little known about this group including where they live and what they eat. Not clear whether their simplicity is due to being an early form, or a simplification of a later form. &otherstitle=Others &othersdescription=Add. &echinodermatatitle=Echinodermata &echinodermatadescription=Include the marine sea stars, sea urchins, sand dollars, and sea cucumbers. Exclusively marine animals. Closest phylum to chordata based on similarity of embryonic development. &brachiopodatitle=Brachiopoda &brachiopodadescription=Look like bivalves such as clams, but not related. Common in fossil record through the Paleozoic. ~300 living species in cold or deep water. Feeding mechanism and embryonic development make it a lophophorate related to bryozoans. &ctenophoratitle=Ctenophora &ctenophoradescription=Called "comb jellies". Look like cnidarians but lack stining cells and bear similarities with bilateral animals. Have eight "comb rows" of fused cilia that beat and propel them through water. Can be bioluminescent. Much unknown. &molluscatitle=Mollusca &molluscadescription=~50-200 thousand species including clams, scallops, oysters, snails, chitons, limpets, abalone, tusk shells, octopus, cuttlefish aplacophorans and monoplacophorans. With external shell like clams, or without like squids and slugs. &pogonophoratitle=Pogonophora &pogonophoradescription=~80 species of deep sea worms with no mouth, gut or anus. Internal bacteria provide food as a byproduct of using O2 and sulfide to produce energy. Lives partly buried at seafloor where O2 and sulfide occur together and can be absorbed by hemoglobin. &bryozoatitle=Bryozoa &bryozoadescription=Small aquatic animals that live by secreting calcium carbonate structures that encrust surfaces or grow upright like plants. Nearly all are marine and colonial. Fossils commonly found in rocks of Paleozoic age. &poriferatitle=Porifera &poriferadescription=One of the earliest animals. Encrusting and upright forms supported by mineral spicules dispersed through body. Feed by beating microscopic flagella so that water moves thorugh the porous body. A few carnivorous and feed similarly to the Venus flytrap. &chordatatitle=Title 14 &chordatadescription=Group that leads to fishes and humans, that includes but is not synonymous with vertebrate. Chordates possess openings from inside of throat to outside of neck (like gill slits) at least sometime during their development. They have a nerve bundle along their backs. They have a cartilaginous roc supporting thenerve cord. They have a tail. &sourceText3=Content generally based on information provided by the UNiversity of California Museum of Paleontology - History of Life Through Time. &craniatatitle=Craniata &craniatadescription=Insert Description Here. &urochordatatitle=Urochordata &urochordatadescription=Insert Description Here. &cephalochordatatitle=Cephalochordata &cephalochordatadescription=Insert Description Here. &sourceText4=Content generally based on information provided by the UNiversity of California Museum of Paleontology - History of Life Through Time. &myxititle=Myxinoidea &myxidescription=Insert Description Here. &conodontatitle=Condonta &conodontadescription=Insert Description Here. &pteraspidomorphititle=Pteraspidomorphi &pteraspidomorphidescription=Insert Description Here. &osteaostracomorphititle=osteaostracomorphi &osteaostracomorphidescription=Insert Description Here. &thelodontititle=Thelodonti &thelodontidescription=Insert Description Here. &anaspidatitle=Anaspida &anaspidadescription=Insert Description Here. &petrotitle=Petromyzontida &petrodescription=Insert Description Here. &gnathostomatatitle=gnathostomata &gnathostomatadescription=Insert Description Here. &sourceText5=Insert source here...