Eastern Screech Owls

SCIENCE 7 TOPIC 12

Three traits that all chordates share Which ones do we need to know?

Three traits that all chordates share Which ones do we need to know? A rod-like, flexible structure for support that is present at least part of the animal’s life

Three traits that all chordates share Which ones do we need to know? A.K.A nerve cord extending the length of the body

Three traits that all chordates share Which ones do we need to know? A.K.A nerve cord extending the length of the body NervechordNervechord

Three traits that all chordates share Which ones do we need to know? Used for respiration and may be present only during the early stages of life

Human gill slits. (branchial arches)

Human gill slits (a.k.a. branchial arches)

So, what are the three groups of chordates? 1 st, just for fun, here are some examples

Here is the first of the three chordate groups you should know about: 1. The tunicates

a) They are invertebrates, but are still chordates because they have notochords prior to becoming adults

1. The tunicates a) They are invertebrates, but are still chordates because they have notochords prior to becoming adults b. They are filter feeders

1. The tunicates a) They are invertebrates, but are still chordates because they have notochords prior to becoming adults b. They are filter feeders c. They are known as sea squirts

Here’s what sea squirts look like on the inside…

Here is the second of the three chordate groups you should know: 2. The lancelets

a) These are invertebrates that retain their notochord throughout their lives

3. The lancelets a)These are invertebrates that retain their notochord throughout their lives b. As adults they look like fish but are not

We already know what lancelets look like on the inside…remember?

Here is the third of the three chordate groups you should know: 3. The vertebrates

Now, these are the three chordate groups you should know about 3. The vertebrates a) These have backbones

3. The vertebrates a) These have backbones b. Have a skeleton made of living cells

3. The vertebrates a) These have backbones b. Have a skeleton made of living cells c. These have closed circulatory systems

3. The vertebrates a) These have backbones b. Have a skeleton made of living cells c. These have closed circulatory systems d. These have advanced nervous systems

3. The vertebrates a) These have backbones b. Have a skeleton made of living cells c. These have closed circulatory systems d. These have advanced nervous systems e. Warm or cold blooded

The three traits all fish share

The Growler Dives With The Fishes

The three traits all fish share Fish use gills to breathe

The three traits all fish share Fish use gills to breathe Fish reproduce using external fertilization

The three traits all fish share Fish use gills to breathe Fish reproduce using external fertilization Fish have a two chambered heart

The three groups of fish start with the jawless fish

-lack scales, fins, and noticeable jaws

The three groups of fish start with the jawless fish -lack scales, fins, and noticeable jaws -have worm-like shape

The three groups of fish start with the jawless fish -lack scales, fins, and noticeable jaws -have worm-like shape -the hagfish and lamprey

The three groups of fish start with the jawless fish

The second fish class is the cartilage fish

-have scales, fins, and jaws

The second fish class is the cartilage fish -have scales, fins, and jaws -no bones – cartilage makes up their skeleton

The second fish class is the cartilage fish -have scales, fins, and jaws -no bones – cartilage makes up their skeleton -shark and manta ray

Here’s the manta ray…

The third class of fish are the bony fish

-largest subclass of fish

The third class of fish are the bony fish -largest subclass of fish -have scales, fins, and bones

The third class of fish are the bony fish -largest subclass of fish -have scales, fins, and bones -perch and tuna

Here’s the perch, by the way…

The three traits all amphibians share

1. They go through metamorphosis

The three traits all amphibians share 1. They go through metamorphosis - hatch from eggs and begin as water dwellers breathing with gills

The three traits all amphibians share 1. They go through metamorphosis - hatch from eggs and begin as water dwellers breathing with gills - as adult, they live on land using lungs and moist skin to breathe

The three traits all amphibians share 2. They have a three chambered heart

The three traits all amphibians share 3. Need to return to water to reproduce

The two groups of amphibians 1. The tailless amphibians such as the frog and …

The two groups of amphibians 1. The tailless amphibians such as the frog and… toad

The two groups of amphibians 2. The tailed amphibians such as the salamander and the…

The two groups of amphibians 2. The tailed amphibians such as the salamander and the… NEWT

The traits all reptiles share

a) Dry scales that hold moisture

The traits all reptiles share a) Dry scales that hold moisture b) Lay eggs with leathery shell

The traits all reptiles share a) Dry scales that hold moisture b) Lay eggs with leathery shell c) 4 limbs with claws (except the snake)

The traits all reptiles share a) Dry scales that hold moisture b) Lay eggs with leathery shell c) 4 limbs with claws (except the snake) d) Most have 3 chambered heart

The traits all reptiles share a) Dry scales that hold moisture b) Lay eggs with leathery shell c) 4 limbs with claws (except the snake) d) Most have 3 chambered heart e) Use lungs

The traits all reptiles share a) Dry scales that hold moisture b) Lay eggs with leathery shell c) 4 limbs with claws (except the snake) d) Most have 3 chambered heart e) Use lungs f) Int. fertilization

The three groups of reptiles 1. The turtles have two shells and an endoskeleton for protection. Some live on land (tortoises) and others in water (sea turtles)

The three groups of reptiles 2. The crocodiles and alligators which have 4 chambered hearts

The three groups of reptiles 3. The snakes and lizards. Lizards have movable eyelids and have ear openings - snakes do not Both can unhinge their jaws to eat

Relax! Thus Ends Our Study of the Three Groups of Reptiles