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1. .Though not all, is the presence of scales

2. .Fish are cold-blooded, or ectothermic

3. .All fish have gills

4. .All fish have a swim bladder

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1. .Birds have all of the same senses  that we have.

2. .Birds have a much more rapid metabolism

3. .Many birds have excellent hearing

4. .They have warm blooded

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1. All mammals are warm blooded

2. They have hair

3. They are vertebrate.

4. Mammals have lungs

5. Mammals feed milk to their babies

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1. . Reptiles are ectotherms

2. .Reptile skin is unique

3. .Reptiles are found in different habitats like very hot deserts

4. .Reptiles have three-chambered hearts

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1. . Amphibians are found in most parts of the world

2. .  They are vertebrates and  have a spine

3. . Adult breathe through their skin

4. . They are carnivorous

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Birds beak
.bird's beak include grooming, moving objects, killing prey, fighting, probing for foo
Bones of birds
In order to fly, birds must reduce body weight as much as possible. One way they do this is by having very light bones.
Birds wings
The bones are relatively long, and the wings taper to a point to allow for high flight speed with low drag
Bird eggs
they are laid by the females and incubated for a time that varies according to the species; a single young hatches from each egg.

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Metatheria
. Vagina and uterus are double
. Integumentary glands are sweat
Eutheria
. Are the best communicators among mammals
. They generally eat everything and each other
Prototheria
. Testes are abdominal
. Egg lying mammals

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Characteristics of orders reptiles class

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Characteristics of orders reptiles class

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Order Squamata
.The order includes Lizards and snakes
. Snakes do not have legs but lizards have legs
Order Crocodilia
. Includes alligators, caimans, crocodiles and gharials
. Alligators have a broad
Order Pterosauria
. They were flying reptiles
. Their size varied

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.They have unhinged circular mouths
. Internal skeleton of agnathans is not bony
.Agnatha consists of the jawless fishes

CHONDRICTHYAN.
.Skin of chondrichthyans is covered with dermal teeth
.Condrichthyans have digestive systems

OSTEICHTHYES
.Are characterized by a relatively stable pattern of cranial bones
.They do not have fin spines