the path of life where do we go from here? from microbes to humans
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The Path of Life
Where do we go from here?
From Microbes to HumansQuickTime™ and a
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Follow The Tree of Life
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By the end of this lesson, you will be able to: Describe the make-up of the Protista
Kingdom Explain the important evolutionary
trends that occur in animal evolution Define the animal characteristics Describe the major groups of animals
and provide their general characteristics
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Where do the protists belong?
Chapter 20 Unsettled group/No
agreement on classification
Any organism that is not a plant, animal or prokaryote
Eukaryote Mostly single-celled
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Zooflagellates
Animal-like Swim with flagella Mostly live solitary
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Sarcodines
Animal-like Move with
extensions of cytoplasm called pseudopods
Ex: ameobas
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Ciliates
Use cilia to move and feed
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Sporozoans
Do not move on their own
Parasites Ex: Cause malaria
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Plant-like Protists
Unicellular algae Different pigment
types Variety of cell wall
structures Cause red tides and
algal blooms
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Multicellular algae
Plant-like structures Ex: Fucus & Kelp
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Fungus-like protists
Heterotrophs tht absorb nutrients
Ex: Sime molds
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What is an animal?
Multicellular Eukaryotes Heterotrophs Lack cell walls Invertebrates (most)
or vertebrate
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Major Animal Evolution Trends:
Cell specialization Organization Development of a
coelom Body Symmetry Cephalization
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What is a coelom?
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What does symmetry mean?
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What does cephalization mean?
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Where do you belong?
Tissues/Organization? Coelom/Body cavity? Symmetry? Cephalization? Invertebrate or
vertebrate?
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