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Are they vertebrate?
-A turtle is a vertebrate because their spine is atached to the roof of the inside part of their Shell. This is why most turtles cannot shed shells.

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Cryptodira, pleurodira and meiolaniidae are the subgroups of chelonians.

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When they are young they live near the coast, but when they grow the go deeper in the ocean.

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When turtles breathe the oxygen passes through the respiratory system to the lungs. Oxygen travels from outside lungs into the alveoli, and the oxygen from the air diffuses into the blood vessels. While this is occurring carbon dioxide diffuses out of the blood vessels and goes outside body.  When oxygen levels are low, turtles have the ability to take in oxygen through their cloaca.

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A turtle is a vertebrate reptile evolved from amphibians. Turtle's body temperature depends on it's surroundings, making it ectothermic. They are more commonly referred to as cold blooded. Metabolic rate is the pace at which energy is used by an organism. Being ectothermic the turtle's metabolism depends on the environment it is in as it's body temperature depends on its surroundings.

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Chelonians is the genus of sea turtles except the green sea turtle. They

are reptiles of the order Testudines or Chelonii characterized by a special bony or cartilaginous shell developed from their ribs and acting as a shield. "Turtle" may refer to the order as a whole or to fresh-water and sea-dwelling testudines.

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Are they vertebrate?
Yes they are because they have a spine of three metres long.

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Crocodilians is the genus of crocodiles, aligators, caimans and gharials.
They are characterized by by the big and powerful jaws with big teeth. They appeard 83.5 million years ago.

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First, the esophagus pushes the food through and into the stomach. The stomach contains acids and digestive enzymes to decompose the food. Then, the liver produces bile and transfers it to the gall bladder. Then the gall bladder transfers the bile to the small intestine.
After, the food  travels to the large intestine, and the
food becomes a waste. Lastly, the waste product exits from the turtle's anus.

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Crocodilians (structure of their bodies)

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Crocodilians (structure of their bodies)

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The snout shape of crocodilians varies between species. Crocodiles may have either broad or slender snouts, while alligators and caimans have mostly broad ones. Gharials have snouts that are extremely elongated.

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Crocodilian teeth are adapted for seizing and holding prey, and food is swallowed unchewed. The digestive tract is relatively short, as meat is a fairly simple substance to digest. The stomach is divided into two parts: a muscular gizzard that grinds food, and a digestive chamber where enymes work on it. The stomach is more acidic than that of any other vertebrate and contains ridges for gartroliths, which play a role in the mechanical breakdown of food.

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The subgroups of crocodilians are algatoridae, crocodylidae and gavialidae.

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Crocodilianans live half life in land and the other half in sweet water

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Turtles are divided into two groups, according to how they retract their necks into their shells (something the ancestral Proganochelys could not do). The Cyptopodira retract their necks backwards while contracting it under their spine, whereas the Pleurodila contract their necks to the side.

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https://en.wikipedia.org/wiki/Turtle

http://reptilis.net/chelonia/senses.html
https://en.wikipedia.org/wiki/Common_box_turtle
https://teasurtles.weebly.com/reproductive-system.html

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The nile crocodile is endangered.

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The respiratory system of a crocodilian is very similar to mammals because it has a trachea conecting the mouth and the lungs were is inspired and and expired. Moreover they also have a palete to separate breathing and eating tubes.

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Introduction, subgrups, structure of their bodies, digestive system, respiratory system,circulatory system, ezcretory system,receptor organs,type of reproduction : https://en.wikipedia.org/wiki/Crocodilia
Vertebrates or invertebrates: http://www.kidport.com/RefLib/Science/Animals/Animals.htm
Habitat, intoduction of the specific animal, scientific name, conservation status, super powers:
ISBN 978-84-675-3556-3

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The excretory system of the turtle is responsible for removing harmful wastes from the turtle's body and blood. The kidney of the turtle performs the blood filtering process and the wastes are then sent to the bladder as urine.  From the bladder the urine goes to the cloaca which is where urine leaves the body. For the liquid, it is taken through the urinary system for nutrients to be taken out.

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1. Animalia

2. Bilateria

3. Deutorostomia

4. Chrordata

5. Vertebrata

6. Gnathostomata

7. Tetrapoda

8. Reptilia laurenti

9. Crocodilia

10. Crocodylae

11. Crocodylus laurenti

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This crocodile is the biggest crocodile because it can metre 5.5 metres

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The skin of crocodilians is thick and cornified, and is clad in non-overlapping scales known as scutes, arranged in regular rows and patterns. These scales are continually being produced by cell division in the underlying layer of the epidermis, the stratum germinativum, and the surface of individual scutes sloughs off periodically. The outer surface of the scutes consists of the relatively rigid beta-keratin while the hinge region between the scutes contains only the more pliable alpha- keratin.

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Scientific name (African spurred tortoise)

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Scientific name (African spurred tortoise)

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Geochelone sulcata

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The sea turtles are able to see well both in water and on land, an adaptation that is very helpful for nesting females.

Along with good sight these animals also possess colour vision. A chelonian will be drawn to foods that are green, red, yellow or moving and so depend greatly on their sense of sight.

Chelonians use smell sense also during mating and escape. During the mating season the females will produce pheromone chemicals that will tell the males when they are ready to mate.

Chelonians lack any external ear opening. Turtles can still hear air vibrations. Their tympanic membranes are covered by a thin layer of skin that acts as an ear drum allowing the animal's to hear auditory stimuli.

Even though they are clothed in a bony shell, chelonians are quite capable of feeling touch. This is accomplished by thin lines of nerves running all over the shell. These nerves can pick up pressure differences, but lack pain receptors. So if you were to lightly touch the shell of a turtle, it would feel you doing it.

While many species do possess taste buds, it is not well known how sensitive they are. Some species like the snapping turtles lack taste buds, as do many tortoises. This allows the animals to swallow food that would be considered poisonous or would bite back, without feeling to many ill effects.

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Chelonians are considered in vulnerable

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Sea turtles like all other turtle species exhibit internal fertilization. Sperm, from the male's penis, leaves the male and enters the female. Fertilization of the egg actually occurs in the oviducts of the female. All species of turtles lay eggs on land. They migrate long distances,thousands of miles, to lay their eggs on the beaches where they were born.