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- has two opening which helps the exit of waste. ( human advantage).
-Lack of peristalsis. (disadvantages)
- take in nutrients and let waste out. ( frog advantage)
- bigger liver because of all the bad things it digests (disadvantages)
- slow feeding helps with the digestion tract (8horses advantage)
-because of this horses need to eat a lot in order to remain full. (disadvantages)
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the digestive system is made up of the gastrointestinal tract also called the GI tract or digestive tract and the liver, pancreas, and gallbladder. The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus.

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Comparing anatomies of different species can tell us more about our ancestors. and how much we are like animals than we think. Also it tells us the structural comparisons of evolution.

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The Phylum of of a earthworm is the Annelid. The phylum of a horse is the chordate. The phylum of a frog is chordate also. the human is also chordate.
kingdonm
-animals (human)
- animals (horse)
aimals (earthwomr)
-animals (frog)
human- class mammal
horse- mammal
frog- amphibians
worm- marine
habitat- frog- ponds
worm- soil
horse-domesticated

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The functions of a frogs digestive system evolved from a tadpoles tail to what it is now a frog. with human like organs. Over time the horses large intestine has been adapted to extract extra nutrition from the fiber content of the forages that pass through the small intestine. Just as humans. The worm and humans intestine and esophagus evolved the same way by starting digestion with the mouth.

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Cothran, E. Gus, and Alois Wilhelm Podhajsky. “Horse.” Encyclopædia Britannica, Encyclopædia Britannica, Inc., 4 Jan. 2018, www.britannica.com/animal/horse/Evolution-of-the-horse.

Maxmen, Amy. “Evolution: A Can of Worms.” Nature News, Nature Publishing Group, 9 Feb. 2011, www.nature.com/news/2011/110209/full/470161a.html.

“Ancient Amphibian: Debate Over Origin Of Frogs And Salamanders Settled With Discovery Of Missing Link.” ScienceDaily, ScienceDaily, 21 May 2008, www.sciencedaily.com/releases/2008/05/080521131541.htm.

Fox, Maggie. “Genetics Suggest Modern Female Came First.” ABC News, ABC News Network, abcnews.go.com/Technology/story?id=119799&page=1.

“Differenceof Human and Frog Digestive System.” Scribd, Scribd, www.scribd.com/doc/285383328/Differenceof-human-and-frog
digestive-system.

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For both the frog and human both intestines are located below the stomach. The function is pretty the same in the large intestine of a horse and human. Unlike humans the worm only has an intestine. Although their one intestine does the same job.

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Just as humans a frogs small intestine is where most of the digestion occurs. Frogs' teeth are only used to hold

something in place. Humans use their teeth for all functions. Instead of a small intestine it's called a small colon in a horse. Just as humans food is broken down and then goes through the small intestine. Surprisingly a worm and humans digestive system is pretty similar. Which means the same function goes on in both.

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A frog and humans function are pretty similar. Both organisms has a gallbladder near the kidney. Which store bile after produced by kidney. although their is a difference.  A human liver has four lobes while a frog only has three. With a horse their mouth does the same job as a humans which is mechanical processing. Although horses don't have a gallbladder like humans. Mechanical digestion in humans occurs in the mouth; mechanical digestion in a worm occurs in the gizzard. A worm has two opening just as humans which are the anus and mouth.

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Well for starters a frog and human has one main difference which is their shelter. For example a frog can live in or out of water while humans can't. A comparison between the frog and human is that the digestive system works just the same in both human and frog. The comparison of a human and horse is that we stand upright and horses stand prone on their four legs or limbs. A difference is the muscles which comes from the different diets of these organisms. Now for a worm you may not have though about it, but the structure of a human and worms brain is just about the same.

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overall all species basically evolved from mainly natural selection and genetics

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function- The function of the digestive system if to basically digest and absorb.
Purpose:  The purpose of the digestive system is to break down food into smaller molecules. These molecules are then absorbed into the body.

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By: Diamond Adams, Elijah Banks and Alexis Campbell