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Which lay external eggs. There are only a few types of animmals that are monotremes. This are almost the only monotremes that exist:

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Which carry and gestate their fetuses internally.

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Which carry their babies in a pouch*.

*POUCH: A baglike structure in the body of certain animals suc as the kangaroo or the koala.   source

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source

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Mammals live in almost every habitat on Earth. This includes habitats in polar regions, tropical forests... They can live under the sea, in the African savannah ...
source

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Sense organs allow animals to sense changes in the environment  and respond appropriately.
The senses are divided in two groups:
1.general senses: of touch, pressure, pain and temperature, that are sense through the skin.
2.special senses: which include the senses of smell, taste, sight, hearing and balance.
source

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All mammals are vertebrates because they have a skeleton, which supports the body and protect the organs.

If we did not have bones, we would be like this

source: book

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1. Mammals have a skeleton which supports muscles and ligaments.

2.  Hair made of keratin .

3.  They have mammary glands, which produce milk.

source

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All About Mammals for Children: Cats, Bears, Elephants, Pandas and More - FreeSchool

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The circulatory system, is an organ system that permits blood to circulate and transport nutrients , to the cells in the body
They have closed system.

source

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The excretory system is responsable for remove wastes.

1. Kidney: The kidney regulates the salt and water from the blood and remove wastes

2. Ureter: transport urine from the kidneys to the bladder.

3. Bladder: The urine is store here temporarely, then, the urine is expelled through the urethra.

source

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Is a system consisting of organs and structures used for breathing. It takes O2, put it into the blood trough lungs, and expell CO2.
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Mammals have a digestive track. It is divided into:

1. Mouth: mastication .

2. Esophagus: transporting tube.

3. Stomach: initial digestion.

4. Small intestine: digestion continues.

5. Large intestine: absorbs the nutrients

6. Rectum: Final absorption and send the waste to the anus.

source

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Most mammals are viviparous, which means they give birth to live young. In most species the male have to
fertilize the female and then a baby is formed.
source

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Balaena mysticetus

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Its a pity that this whale is almos extinct. The bigger group the have ever seeing

in recent decades was "about 66 specimens"
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The balaena mysticetus or boreal whale is a spectacular mammal:

1.  It can live over 250 years!

2. It also can grow up to 20 meters in length.

3. Either they can live so much time they don't suffer illneses such as cáncer.

4. It can live sow much (It is the oldest mammal in the world) because it regenerate cells, and ivestigators still do not know how

source

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The bowhead whale is called like that because of its bow-shaped mouth and because it has a black color

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VIDEO