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CLEP BIRDS

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Birds: evolution, features, digestion, circulation

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Tharwat A
Tharwat A
Palestina

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CLEP BIRDS

Birds: evolution, features, digestion, circulation

Tharwat A
1

stability reduced asteroid extinction disasters natural

According to current hypotheses , this extinction was probably caused by a combination of , including massive and widespread volcanic eruptions , a fall in sea level , and a huge smashing into what is now the Yucatán Peninsula in Mexico . That collision produced forest fires and dust clouds . These environmental changes ecosystem and led to the of most dinosaurs along with many other animal and plant groups on land and in the sea .

2

bones hollow fly breastbone Endoskeleton better muscles Respiratory

Skeleton ( )

Light weighted due to consisting of bones inside ( to help the bird ) .
In the , there are strong connected to the wings : helping birds fly .
systems connected throughout the hollow .

3

directions harder balanced danger navigate

Tail :
Tails help birds stay during flight ( can fly without , however ) .
Help birds where they ? re headed ( for example , sensing if there is any on the way ) .
The tail helps the bird go in different during flight as wel l

4

four energy nutrients regulating vessels ventricles blood two carry oxygen waste removing temperatur lungs heart separate

The circulatory system of birds includes a , blood and
Birds' hearts have chambers .
This adaptation makes it possible for the body to and , giving birds the they need to fly and keep up their high levels of activity .
The heart had atria and two that completely oxygenated and deoxygenated blood .
The left ventricle pumps blood throughout the body , the right ventricle delivers blood to the
Birds can handle the metabolic needs of flying ( and running , swimming , or diving )
In addition to providing oxygen to body cells and metabolic , the cardiovascular system is crucial in a bird's body

5

esophagus grit crop intestine stores acid water juices liver absorbing gizzard stomach

food moves down a tube called the
and into the , which excess food so
the bird can digest it slowly .

The food then moves to the first part of the
, where it is softened by gastric ,
mucus , and other digestive .
The second part of the stomach , the ,
grinds the food into smaller pieces , often with
the aid of such as sand or small stones the
bird has swallowed earlier .

Once the food is sufficiently broken down , it moves into the small intestine , where the and pancreas help with nutrients .
Next is the large , which is very short for most birds . Where the small and large intestines join are the ceca , two pouches that help absorb any remaining from the food and finish the digestive process .

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