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Ch. 3-----Invertebrates

1. Water 2. oxygen 3. food 4. protection from other animals 5. protection from danger
What are the 5 basic needs of ALL ANIMALS?
by seeing if the animal has a backbone or if it does not have a backbone
How do scientist first classify animals?
Animals with a backbone
What is a vertebrate?
What are vertebrates also known as?
Animals with NO Backbone
What is an invertebrate?
1. notochord 2. nervechord 3. gillslits 4. a tail
What are the 4 characteristic of a chordate?
Bones that lie within an animal's body; endo means INSIDE
What is an endoskeleton?
96 %
What percentage of animals are invertebrates?
Most invertebrates have a what?
1. sponges 2. cnidarian 3. worms 4. mollusks 5. arthropods 6. echnoderms
What are the 6 examples of invertebrates talked about in this chapter?
1. can live in any environment 2. crawl, walk, swim, and fly
What 2 things makes invertebrates the most common and numerous species of animals?j
As an animal that filters the water that it lives in.
What is a sponge?
Because unless Scientists use a high magnification to observe a sponge then a scientist would think that a sponge was a PLANT.
Why did scientist first classify sponges as plants?
Tiny rodlike structures of tough protein called SPICULES
What are sponges made out of?
2 layers
How many layers of cells do sponges have?
It takes in water
What does the first layer of the cells of a sponge do?
It pumps water in and out
What does the opening at the top of a sponge do?
A jellylike layer that contains cells that have different functions.
What is found in between the outer and inner surface of a sponge?
They carry food from the collecting cells to the other cells in the sponge; and they also make materials that form a kind of skeleton for the sponge
What does the jellylike layer do?
Water leaves the sponge's body through this opening called the VENT Pumps water in and out.
What does the opening at the top of a sponge do?
A jellylike layer that contains cells that have different functions.
What is found in between the outer and inner surface of a sponge?
They carry food from the collecting cells that have different functions. And, they carry food from the collecting cells to the other cells in the sponge.
What happens between the outer and inner surface of a sponge---the jellylike layer?
In shallow ocean waters where they attach themselves to hard underwater surfaces, such as the ocean floor, rocks, etc.
Where do most sponges live?
Cnidarians are carnivorous, or meat-eating, invertebrates. THey have tentacles all around the mouth.. Once they digest food, wastes leave through the mouth.
What are cnidarians?
1. tentacles 2. mouth 3. no organs 4. they live in water 5. they have radial symmetry
What are the 5 charcteristics of cnidarians?
1. The outer layer of tissue of a cnidarian protects the organism 2. The inner layer of tissue digests its food 3. cnidarians have sensory cells
What are the 3 functions of cnidarians' tissues?
They belong to the only class of freshwater cnidarians.
What are hydras?
A cnidarian that has a vase shaped form like a hydra. Sea anemones and corals are polyps.
Whar are polyps?
Another form of a cnidarian. Medusas have bowl-shaped body from which its tentacles hang down. A MEDUSA IS THE ADULT STAGE IN THE LIFE CYCLE OF SOME CNIDARIANS. Adult jellyfish are MEDUSAS.
What is a medusa?
Radial Symmetry
What type of symmetry does a cnidarian have?
1. jellyfish 2. sea anemones 3. corals
What are 3 examples of a cnidarian?
1, flatworms 2. round worms 3. parasitic worms 4. segmented worms
What are the 4 types of worms?
1. has a flattened body 2. has a digestive system with only 1 opening 3. has a simple nervous system
What are the 3 characteristics of a flatworm?
What is an example of flatworms?
In fresh water streams, lakes, and ponds
Where do most flatworms live?
1. tube like body 2. has 2 openings in its digestive system 3. has a brain with their nervous system 4. has sex organs 5. the muscles in a roundworm run lengthwise through the worm's body
What are the 5 characteristics of a roundworm?
On or in another animal and it feeds on that animal.
Where do parasitic worms live?
1. Tapeworms and flukes 2. Hookworms 3. Trichinella
What 3 examples of a parasitic worm?
In pigs
Where are most parasitic worms found?
an earthworm
What is an example of a segmented worm?
1. Circulatory system 2. 5 enlarged tubes that act as hearts 3. has a nerve center or brain in its head 4. they have 2 sets of muscles 5. they have both male and female sex organs 6. to get oxygen earthworms breathe through their thin, moist skin
What are the 6 characteristics of a segmented worm?
an animal with a soft body and no bones
What is a mollusk?
THeir shells protect their bodies and offer support. THe shell can grow as the mollusk grows.
What does the hard shell do for a mollusk?
Where is the shell of the mollusk formed?
1. slugs 2. snails 3. clams
What are 3 examples of mollusks?
By using its muscular FOOT
How does a mollusk move?
Clams and oysters have this 2 hinged shell that fits together. When a bivalve senses danger it pulls the shells together.
What is a bivalve?
Clams and oysters
2 examples of bivalves?
it is used like a drill to cut through hard surfaces such as clamshells so the snail can get food.
What does a radula do?
What type of molllusk has a radula?
Octopods and squid
What mollusks are the most intelligent and active?
Tentacles ( octopods and squid have these)
How do these mollusks' move?
It uses its jet motion to get away quickly in any direction and it can squirt out a dark inky liquid which forms a cloud in the water and hides the animal as it gets away.
How do octopods and squid protect themselves?
an animal that has a jointed exoskeleton
What is an arthropod?
Protects it and gives it support
What are the 2 functions of the artropod's exoskeleton?
1. legs 2. circulatory system 3. brain 4. 2 openings
What are the 4 major characteristics of an arthropod?
1. grows an exoskeleton 2. sheds its exoskeleton 3. exoskeleton does not grow with the body
3 examples of artropods and describe their bodies
Out of the 3 arthropods which is the largest group?
Insects are the ONLY INVERTEBRATES that can do what?
1. pollinate 2. food source 3. eat other animals 4. produce goods
What are the 4 ways arthropods help the environment?
1. destroy crops; 2. house hold plants 3. venomou to people
What are the 3 ways arthropods hurt the environment?
an invertebrate that has an internal skeleton and spines sticking out from its body
What is an echinoderm?
Spiny and Skin
What does echinoderms mean?
They ONLY live in the OCEAN
Where do echinoderms live?
1. starfish 2. sand dollars 3. sea urchins
3 examples of echinoderms------
1. it has no brain 2. it has nerves that help it to move and feed 3. they have radial symmetry 4. they have powerful jaws and have posinous glands 5. they have 5 rows of teeth and a mouth at the center
What are the 5 charcteristics of echinoderms?