The Path of Life Where do we go from here? From Microbes to Humans.
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Transcript of The Path of Life Where do we go from here? From Microbes to Humans.
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
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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