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Invertebrates

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Title: Invertebrates


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Invertebrates
Starfish
Arthropods
Mollusks
Insects
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Introduction to the Animal Kingdom
  • 4 Characteristics that ALL animals share
  • Be multicellular composed of more than 1 cell
  • Be Eukaryotic have a nucleus and other
    organelles in each cell
  • Be Heterotrophic Consume or eat food
  • Have no cell walls

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  • Animals carryout 7 essential functions to
    survive.
  • Feeding- all animals must obtain food
  • Respiration- all animals must take in oxygen and
    give off carbon dioxide
  • Circulation- all animals must have a system of
    transporting oxygen, nutrients and waste

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  • 4. Excretion- all animals eliminate waste
  • 5. Response-most animals have nerve cells or a
    nervous system to respond to stimuli.
  • 6. Movement- most animals have muscles or
    muscular/skeletal systems for movement or they
    have a way to move or circulate water for
    feeding.
  • 7. Reproduction-most reproduction is sexual using
    haploid gametes

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Concept Map
Section 26-1
Animals
are
have
are
carry out
Multicellular
with
such as
No cell walls
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  • From simple groups of animals to more complex
    groups, the body characteristics that develop
  • A. Cell specialization- animal have different
    types of cells which have special structures to
    perform special tasks.
  • B. Levels of organization - animal bodies are
    organized to carry out complex functions-
  • Cells form tissue
  • Tissues form organs
  • Organs form organ systems

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Levels of Organization
Section 7- 4
Muscle cell
muscle tissue
Organ
Organ system
Go to Section
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  • C. Body symmetry, 2 types
  • 1. Radial- simple animals body parts repeat
    around center
  • 2. Bilateral- complex animals body has two equal
    halves which allows for cephalization and a
    coelom
  • Cephalization- sense organs are concentrated near
    front
  • Coelom Body cavity- most animals have an
    internal space for organs to be cushioned and
    protected.

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Figure 265 Body Symmetry
Section 26-1
Bilateral
Radial
Posterior end
Dorsal side
Anterior end
Ventral side
Complex
Simple
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  • D. Similar Early Development In most animals,
    zygote divides to form a hollow ball of cells
    called a Blastula. The blastula develops 3 layers
    of cells called germ layers
  • Endoderm- innermost, forms digestive tract and
    respiratory system.
  • Mesoderm- middle, forms muscles, circulatory and
    reproductive systems
  • Ectoderm- outer, sense organs and skin
  • Blastopore- hole that will form mouth or anus

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  • B. Animals are separated into 2 groups
  • Invertebrates- have no backbone, largest group,
    many phyla.
  • Vertebrates- have a backbone, one phylum

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Figure 334 Diversity of Chordates
Section 33-1
Nonvertebrate chordates (4)
Mammals (8)
Birds (18)
Fishes (47)
Reptiles (14)
Amphibians (9)
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  • The Vertebrates
  • Vertebral Column (developed from the outer
    portion of the notochord)
  • Endoskeleton of cartilage or bone that grows with
    the animal
  • Brain encased by skull
  • Complex organ systems

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Echinoderm Ancestor
Notochord and Hollow Nerve chord,
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  • Classification of the 7 living classes
  • 1. Class Agnatha Jawless fishes. Lamprey -
    parasitic, Hagfish -scavengers.
  • a. Eel shaped, Jawless, sucker shaped mouth,
    Cold blooded, Only have a few cartilage plates
    in their skull , External fertilization, lay eggs
    in water, have gills

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Hagfish
Digests decaying fish from inside out. Secretes
huge quantities of slime to defend itself. Ties
itself in a knot to get rid of slime
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Most important evolutionary event in animal
history
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  • 2. Class Chondrichthyes Cartilaginous fishes.
    Sharks, skates, rays.
  • a. Skeleton of Cartilage, Paired fins,
    Cold-blooded, Tooth like scales on skin called
    dermal denticles, moveable jaw attached to skull,
    Internal External fertilization

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Great White
Hammerhead
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Tiger Shark
Blue Shark
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Close Up of Shark Skin
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  • 3. Class Osteichthyes- Bony fishes. Perch, trout,
    catfish, bass
  • a. Skeleton of bone, Gill cover called operculum,
    Body covered by scales, Cold-blooded, Most
    External fertilization

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Perch
Goldfish
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  • 4. Class Amphibia Frogs, toads, salamanders.
    (DOUBLE LIFE)
  • a. As larva, have gills. As adults, have lungs
    and limbs adapted for life on land. Reproduce in
    water lay eggs in water. Cold-blooded. Have
    moist skin usually do not have claws

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The Life Cycle of a Frog
Metamorphosis- Major body change over a life time.
Section 30-3
Adult Frog
Adults are typically ready tobreed in about one
to two years.
Young Frog
Frog eggs are laid in water and undergo external
fertilization.
The eggs hatch into tadpoles a few days to
several weeks later.
Fertilized Eggs
Tadpoles
Tadpoles gradually grow limbs, lose their tails
and gills, and become meat-eaters as they develop
into terrestrial adults.
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Tree Frog
Southern Toad
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4 toed salamander
Marbled Salamander
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  • 5. Class Reptilia- Snakes, lizards, turtles, and
    alligators.
  • a. Reproduce on land by laying leathery eggs. The
    amniotic egg makes reptiles the first group to be
    well adapted to life on land. Dry, scaly skin
    with claws on the toes. Well-developed lungs.
    Cold-blooded

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Eastern Diamondback Rattlesnake
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Snapping Turtle
Gopher Tortoise
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  • 6. Class Aves- Birds.
  • a. Have feathers and bodies adapted for flight
    Hollow or partly hollow bones, Lungs Air Sacs,
    Large Chest Muscles. Reproduce by laying eggs
    with calcium shell. Warm-blooded.

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American Bald Eagle
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  • 7. Class Mammalia Mammals.
  • a. Most young develop internally and are nursed
    after birth on milk created by mammary glands.
    Most have fur or hair at some time during their
    lives. Well-developed brain. Warm-blooded

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Hard Shells
Fur Milk Glands
Amniotic Egg
Lungs
Bony Skeleton
jaws
Brain Encased Skull
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