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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?

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