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Chapter 23 Class Notes

Chapter 23.1

Diverse Animals share Several Key Characteristic

Define Key Terms

*Blastula

*Gastrula

*Larva

*Metamorphasis

*Invertebrate

*Vertebrate

What is an Animal?

*More than a million living species are organized into about 35 groups (Phyla)

* Animals share 4 Key Characteristics

                           -Animals are Eukaryotic

                           -Animals Cells lack cell walls

                          -Animals are multicellular

                          -Animals are hetertrophs that ingest food

*The 4th characteristic refers to how animsl obtain nutrition

Comparition of Kingdoms in the Domain Eukarya

 

 

 

 

Protists

Fungi

Plants

Animals

 

Eukaryotic

All

All

All

All

 

Lack Cell Walls

 Some

Few

None

All

 

Multicellular

Some

Most

All

All

 

Heterotrophic

Some

All

Few

All

 

 

 

 

 

 

 

 

 

 

 

 

 

Life Cycles

 *The Life cycles of mose animals are different, especially in the early stages of development.

*Adult male and femals animals produce haploid gametes by Meiosis.

*Sperm fuses with the egg= Zygote = Blastula = Gastrula

*From the Gastrula Stage, many animals develop directly into adults

*The Larva (an immature form of an animals) looks different from the adult form and usually eats different food.

*The Larva has to undergo a change (Metamorphasis) to become an adult

*Examples: Butterflies & Frogs

 Examples of Metamorphosis in different life Cycles

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Invertebrates and Vertebrates

*One way to group animals is based on whether they have a backbone or not.

*Invertebrates: are animsla without a backbone Examples: Sponges, Octopus and Jelly Fish

*Vertebrates: are animals with a backbone Examples: Humans, dogs, birds and snakes

Assessment

*Complete Concept Check 23.1

* Answer all questions in a complete sentence

*We will go over the answers together in class.

Chatper 23.2

Sponges are relatively simple animals with porous bodies

Define Key Terms

*Sponge

*Collar Cell

*Amoebocyte

*Sessile

The Body of a Sponge

*Sponges are the simplest animals

*Unlike other animals, sponges lack true tissues or Organs (See Figure 23-4)

*As water flows through the sponges body, the water is filtered for food particles (Mostly bacteria)

*Sponges live singly or in clustered formed by budding.

Sponge Reproduction & Life Cycles

*Budding is a form of asexual reproduction, in which a new sponge grows (buds) out from the parents.

*Sponges can also reproduce sexually and most sponges have both male and female gameste producing structures.

*Adult Sponges are Sessile (Anchored in one place)

 

Additional facts about Sponges

*Sponges have chemical defenses that protect them agains predators, diseases and parasites.

*Sponges have powerful natural anitbiotics that fight against bacterial infections.

*There are 9,000 known species of sponges which are diverse in shape, size and color.

(Bath Sponges where once alive)

The Diversity of Sponges

        

 

Assessment

*Complete Concept Check

*Answer all questions in a complete sentence

* We will go over the answers together in class.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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