Which evolved first, the anus hole or the colon ?

[Rick O'Shez]

why we don't have one eye as well ? why 2 legs ? why 2 hands ?

Two eyes give a distinct advantage in terms of judging distance and direction. Two legs means you can move a lot faster, two hands means you can perform more complex tasks and use tools, etc. On the contrary there would be no advantage in having two bum-holes.

 

[Jainarayan]

It says that human like you have an amazing anus and scientist aren't able to figure out how it was evolved.

Who cares? Yes, it is amazing, I'm glad I have one and it serves me well. Trying to figure out where my butthole came from isn't going to change the fact I have one.

 

[FearGod]

Two eyes give a distinct advantage in terms of judging distance and direction. Two legs means you can move a lot faster, two hands means you can perform more complex tasks and use tools, etc. On the contrary there would be no advantage in having two bum-holes.

So was the 2 eyes among other choices, i mean 4,5,6,7 ..etc eyes and the one which survived and were the fittest are the ones with 2 eyes or it was always 2 eyes and always one anus..etc

 

[Jainarayan]

Hey peeps, I think we have some of this goin' on, right here.

 

[Kuzcotopia]

So was the 2 eyes among other choices, i mean 4,5,6,7 ..etc eyes and the one which survived and were the fittest are the ones with 2 eyes or it was always 2 eyes and always one anus..etc

The article you posted describes, for example, a flatworm that has multiple holes, as well as certain organisms that use the same hole for both food and waste.

Did you read the article you posted in it's entirety? These possibilities exist, but one hole has proven to be the most advantageous mutation for the majority of species that have one.

If you believe in a designer who created the universe and the organisms in it, being passive aggressive about it won't convince a single person, ever.

Trust you opinion and argue reasonably. If that is too frustrating, try Netflix.

 

[FearGod]

The article you posted describes, for example, a flatworm that has multiple holes, as well as certain organisms that use the same hole for both food and waste.

Did you read the article you posted in it's entirety? These possibilities exist, but one hole has proven to be the most advantageous mutation for the majority of species that have one.

If you believe in a designer who created the universe and the organisms in it, being passive aggressive about it won't convince a single person, ever.

Trust you opinion and argue reasonably. If that is too frustrating, try Netflix.

Which one has many holes the deuterostomes or the protostomes.

 

[Kuzcotopia]

Which one has many holes the deuterostomes or the protostomes.

I don't understand the question. Could you elaborate based on your knowledge of cell growth and differentiation first, so I understand what you're asking?

 

[Rick O'Shez]

So was the 2 eyes among other choices, i mean 4,5,6,7 ..etc eyes and the one which survived and were the fittest are the ones with 2 eyes or it was always 2 eyes and always one anus..etc

Yes, generally it's the most efficient combinations which prosper the best. Two bum-holes and six eyes would be unnecessarily complicated and involve too much redundancy. Six bum-holes would just be confusing.

 

[Tumah]

Ok. I think its enough with these questions. They're starting to get more than a little...awkward.

 

[Revoltingest]

Do mutations have such limits ? why one hole, a wise choice ? why we don't have one eye as well ? why 2 legs ? why 2 hands ?
Why one anus and one mouth ? mutations don't know logic, but we do.

Evolution is a process which favors some mutations over others. The less successful ones appear at a lower frequency than the successful ones. Take the eye for example....people are born with one eye or no eyes at times. But such people are at a disadvantage to people with binocular vision, which gives us depth perception.

 

[dust1n]

Do mutations have such limits ? why one hole, a wise choice ? why we don't have one eye as well ? why 2 legs ? why 2 hands ?
Why one anus and one mouth ? mutations don't know logic, but we do.

The embryological origin of the mouth and anus is an important characteristic, and forms the morphological basis for separating bilaterian animals into two natural groupings: the protostomes and deuterostomes.

In animals at least as complex as an earthworm, a dent forms in one side of the early, spheroidal embryo. This dent, the blastopore, deepens to become the archenteron, the first phase in the growth of the gut. In deuterostomes (including humans), the original dent becomes the anus, while the gut eventually tunnels through the embryo until it reaches the other side, forming an opening that becomes the mouth.[1] It was originally thought that the blastopore of the protostomes formed the mouth, and the anus was formed second when the gut tunneled through the embryo. More recent research has shown that our understanding of protostome mouth formation is somewhat less secure than we had thought. The edges of the dent appear to move together and close up in the middle, leaving openings at the ends which become the mouth and anus.[2] However, this idea has been challenged, because the Acoelomorpha, which form a sister group to the rest of the bilaterian animals, have a single mouth which leads into a blind gut (with no anus). The genes employed in the embryonic construction of the flatworm mouth are the same as those expressed around the protostomes', which suggests that the two structures are equivalent, and that the older ideas about protostome mouth formation were correct.[1] An alternative way to develop two openings from the blastopore during gastrulation, called amphistomy, appears to exist as well in animals like nematodes.[3][4]

http://en.wikipedia.org/wiki/Embryological_origins_of_the_mouth_and_anus

This is just an illustration that there are creatures that have mouths but no anus.

 

[Yerda]

I cant blame you of making personal comments because we have a saying in Turkiye ; "If imam farts, then jamaah (community) sh.ts."

If staff makes such things, ofcourse members makes it in a much more worse ways.

I've already apologised.

 

[Sapiens]

Do mutations have such limits ? why one hole, a wise choice ? why we don't have one eye as well ? why 2 legs ? why 2 hands ?
Why one anus and one mouth ? mutations don't know logic, but we do.

I have neither the time and interest to backfill your education and then teach you a course in developmental biology, since all you are really looking for is a way to make an argument from ignorance. Dust1n's cut and past from wiki is, IMHO, more consideration than you deserve.

So was the 2 eyes among other choices, i mean 4,5,6,7 ..etc eyes and the one which survived and were the fittest are the ones with 2 eyes or it was always 2 eyes and always one anus..etc

Again your lack of formal training is painfully obvious. Are you not embarrassed that you do not realize that there are numerous animals with more than two eyes? Have you never looked closely at a horsehoe crab or a spider? Do you not realize that the compound eyes of many insects are literately thousands of separate eyes?

 

[Monk Of Reason]

Was it the hole first or the colon or both simultaneously ?

Already been answered but what the hell.

The anus or at least a functional anus existed far prior to the development of the colon. For example there are several creatures today that have an anus but no colon. Though the colon is, in reality, part of the anus. They are not two simply separate objects in the body such as feet and hair. The colon is simply the last section of the intestine prior to the anus.

 

[FearGod]

I have neither the time and interest to backfill your education and then teach you a course in developmental biology, since all you are really looking for is a way to make an argument from ignorance. Dust1n's cut and past from wiki is, IMHO, more consideration than you deserve.

The best decision you made, i don't have interest to waste time in reading your answers as well.

 

[Sapiens]

And what is it that anyone might have learned from your questions? Have your little boy fit, it is your loss, not mine.

 

[FearGod]

Already been answered but what the hell.

The anus or at least a functional anus existed far prior to the development of the colon. For example there are several creatures today that have an anus but no colon. Though the colon is, in reality, part of the anus. They are not two simply separate objects in the body such as feet and hair. The colon is simply the last section of the intestine prior to the anus.

Doesn't work like this my friend, there is no first and second as both should be in harmony .

 

[Sapiens]

Doesn't work like this my friend, there is no first and second as both should be in harmony .

Now you show us how little anatomy you know. The colon and anus are differentiated tissues that serve radically different functions. Here's a web page you might learn something from: Blue Histology - Gastrointestinal Tract

 

[Monk Of Reason]

So was the 2 eyes among other choices, i mean 4,5,6,7 ..etc eyes and the one which survived and were the fittest are the ones with 2 eyes or it was always 2 eyes and always one anus..etc

Two eyes was sufficient. Any more might have been wasteful. The massive amount of energy it takes to have eyes that function and the brainpower required to interpret those messages is enormous. Having two eyes takes double that energy and a little more. However being able to have depth perception was enough of an advantage to make it worth while evolutionary.

 

[Monk Of Reason]

Doesn't work like this my friend, there is no first and second as both should be in harmony .

What can be described as a functional anus existed prior to what we consider a colon as a colon is not necessary for an anus. An anus is simply an orphus that allows for the excretion of solid waste. A colon is a development at the end of the large intestines. The large and small intestines are both advancements of a prior less advanced intestinal system which also was linked to an anus. Yes they developed together in some ways but what can be called an anus exited prior to what we could call a colon.