Classification of Living Things
Scientists estimate that there are between 3 million and 100 million species of organisms on Earth. Taxonomists, biologists who specialize in identifying and classifying life on our planet, have named approximately
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About Classification of Living Things
PowerPoint presentation about 'Classification of Living Things'. This presentation describes the topic on Scientists estimate that there are between 3 million and 100 million species of organisms on Earth. Taxonomists, biologists who specialize in identifying and classifying life on our planet, have named approximately. The key topics included in this slideshow are . Download this presentation absolutely free.
Slide1Classification of Living Things Classification of Living Things Scientists estimate that there are between 3 million and 100 million species of organisms on Earth. Taxonomists Taxonomists --biologists who specialize in identifying and classifying life on our planet--have named approximately 1.7 million species so far. 13,000 Each year, about 13,000 new species are added to the list of known organisms. So, how do scientists classify (organize) all these millions of species?
Slide23 Domains and 4 Kingdoms PROKARYOTES no organisms with no nuclear membrane with organisms with a nuclear membrane 2 Types of Cells EUKARYOTES
Slide4The History of Life on Earth The History of Life on Earth Life began on Earth 3.6 billion years ago as a prokaryotic cell (single-celled organism with no nuclear membrane). For 2.6 billion years, life was unicellular. Multicellular eukaryotes ( with nuclear membrane) evolved about 1 billion years ago. The Earth formed 4.5 billion years ago.
Slide5NucleolusNuclear membrane similarities differences Eukaryotes Prokaryotes List the similarities and differences between Eukaryotes and Prokaryotes .
Slide6Life’s History and Diversity Life’s History and Diversity plants fungi animals Note the close spacing of the groups plants ( maize ), fungi ( yeast ) and animals ( humans ). Line length reflects evolutionary distance. We’ve got a lot more in common with bacteria and plants than we think!
Slide7Animals diversified inthe ocean about 600 million years ago . Plants colonized land about 440 million years ago and were followed shortly by animals. Humans of any sort are a very recent evolutionary development (~ 7 million years ago ). Life’s History Life’s History in the ocean
Slide83 Domains and 6 Kingdoms
Slide9The Archaea are one of two groups of prokaryotic organisms , organisms with no nuclear membrane . (Bacteria are the other group.) Archaea are best known for living in extremely hostile environments (very hot, very acid, or very salty), but they can also be found in less extreme conditions . Archaea are believed to be the earliest form of life on Earth. Although both archaea and bacteria are simple life-forms, archaea are very different from bacteria. Archaea do not require sunlight for photosynthesis, as plants do, and they do not need oxygen . Archaea absorb CO 2 , N 2 , or H 2 S and give off methane gas as a waste product. Archaea Archaea ARCHAEA ARCHAEA
Slide10Archaean Extremophiles A Deep Sea Hydrothermal Vent – Prime Habitat for Archaean Extremophiles video of black smoker
Slide11Archaean Extremophiles Hot springs in Yellowstone Park–“Hot” Spots for Archaean Extremophiles Archaea in Yellowstone Searching for Archaea in Yellowstone’s Obsidian Pool Prismatic Pool, Yellowstone Park
Slide12BacteriaBacteria – the Most Abundant Organisms There are more bacteria in your mouth than there have been people living since the dawn of humans. Bacteria ( Staphylococcus aureus ; yellow spheres) adhering to nasal cilia. E. Coli bacteria Borrelia burgdorferi, the bacterium that causes Lyme disease. Mycoplasma hyopneumoniae
Slide13What Good Are Bacteria? What Good Are Bacteria? Newsflash!!! Bacteria discovered that can do photosynthesis! primary recyclers of materials in the environment nitrogen . Bacteria are the primary recyclers of materials in the environment , particularly nitrogen .
Slide14What Good Are Bacteria?Bacteria are also essential for many processes we depend on – sewage treatment , cheese production , antibiotic production , and biotechnological processes like gene cloning and protein production .
Slide15insulinBacteria are used to produce insulin and other drugs that people need.
Slide16EukaryaThe Domain Eukarya is divided into 4 Kingdoms: Protista Fungi Plantae Animalia Classifying Critters activity
Slide17PROTISTSPROTISTS • Protists are eukaryotes because they all have a nucleus . • Most have mitochondria . • Many have chloroplasts with which they carry on photosynthesis. • Many are unicellular and all groups (with one exception) contain some unicellular members. "Eukaryotes that are neither Animals, Fungi, nor Plants" . A better name for Protists would be "Eukaryotes that are neither Animals, Fungi, nor Plants" . Protists Protists Visit Protist Park
Slide18FUNGIFUNGI FUNGI FUNGI Fungi sometimes look like plants, but they’re not! Fungi can’t do photosynthesis , because they don’t have chloroplasts; they get their nutrients from the organic material they live in. Decomposers , like mushrooms , feed on dead organic material. Some fungi feed on living organisms , such as plants, animals and even other fungi. This causes diseases and infections in these organisms (like athlete’s foot and ringworm in humans). Some fungi live as symbiotic partners with algae . The result: lichen (pronounced “like-n”). more lichen Other differences from plants: • fungi don’t have roots, they have a mycelium . • fungi’s cell walls are made of chitin , not cellulose.
Slide19PLANTSPLANTS No vascular system Vascular system Mosses, Liverworts, Hornworts Mosses, Liverworts, Hornworts Seedless Plants (reproduce by spores) Ferns, Horsetails, Club Mosses Ferns, Horsetails, Club Mosses Seed Plants (reproduce by seeds) Gymnosperms (“naked seeds”) Angiosperms (flowers, seeds enclosed in fruit) Conifers Cycads Gingkoes Conifers Cycads Gingkoes Flowering Plants Flowering Plants
Slide20ANIMALSANIMALS Invertebrates (no backbone) Vertebrates (backbone)
Slide21Animal Classification Animal Classification
Slide22mammalsvertebrates, or chordates vertebrates invertebrates As you can see, we mammals (4000 species) are far outnumbered by the other vertebrates, or chordates (38,300). And vertebrates (42,300) are definitely outnumbered by invertebrates (989,700 species). The biggest categories of invertebrates: INSECTS!
Slide243 members of the genus “Felis” (cat).Taxonomy , or classification, enables scientists to assign a very specific name to every species, so that scientists all over the world know exactly what species is being referred to.
Slide25Kingdom P hylum C lass O rder F amily G enus S pecies Remember: K ids P refer C andy O ver F resh G reen S alad Class
Slide26Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Carnivora Suborder: Aeluroidae Family: Felidae Subfamily: Panthernae Genus: Panthera Species: Tigris Species: Tigris Subspecies Panthera tigris altaica Siberian or Amur Tiger, Southeast Russia/China Panthera tigris tigris India Panthera tigris amoyensis Southern China Panthera tigris corbetti Indochina Panthera tigris sumatrae Sumatran Tiger, Sumatra
Slide27PrimatesMammalia Primates – Our Order within the Class Mammalia Humans: Humans: Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Primates Family: Hominidae Genus: Homo Species: H. Sapiens
Slide28This is approximately where the last60 million years of primate evolution has occurred.