2006-06-29 00:28:23 · 12 answers · asked by Anonymous in Science & Mathematics ➔ Zoology
First of all the premise of the question is not entirely correct. Insects do not have their anus between their legs.
Most animals are descended from worm-like animals. A worm, in its simplest form is a tube with a mouth at one end, a gut and an anus at the other end. It is more efficient to put the mouth at the front (direction of travel), so it evolved that mouth is in front, anus is in the rear. Animals descended from that worm ancestor kept the same basic arrangement. When animals developed legs the anus remained at the rear because the arrangement seems to work out pretty well.
2006-06-29 06:58:11 · answer #1 · answered by deadstick325 3 · 0⤊ 0⤋
An animal is basically a receptacle for processing and ruining food. The food goes in one end of the digestive tube and runs all the way along it to the other end, where the remnants are discharged to make room for more fresh food going in the other end. So it makes sense that the tube should be as straight as possible so the animal can go along gobbling in food at one end like a conveyor belt moving along and leaving a slime and dump trail behind. It would not be good to be sliming and dumping on the new food just before you eat it, which would be like spitting into the wind.
The rectal orifice is between the legs so as the animal is straining to discharge the dump it can maintain its balance and not tip over.
2006-06-29 07:41:16 · answer #2 · answered by Kokopelli 7 · 0⤊ 0⤋
the anus is at back ata distance which provides maximum time and place for digestion to take place and its between legs to keep creatures at ease while shitting.
2006-06-29 07:40:30 · answer #3 · answered by first s 2 · 0⤊ 0⤋
How would you look if you have anus in place of you brains and vice versa.
2006-06-29 12:03:00 · answer #4 · answered by Anonymous · 0⤊ 0⤋
It keeps it away from the mouth area to avoid confusion. It also helps that you can walk away from your excretment.. I think someone had a good plan!
2006-06-29 08:05:42 · answer #5 · answered by Gone fishin' 7 · 0⤊ 0⤋
It's a little more convenient than having it between your eyes.
2006-06-29 07:29:57 · answer #6 · answered by JStrat 6 · 0⤊ 0⤋
b cos at the time of develop ment the anterior region b comes oral region and the posterior region becomes aboral or anal region
2006-06-29 08:32:00 · answer #7 · answered by karthik s 1 · 0⤊ 0⤋
That's one of the most lamest questions I've ever read.
2006-06-29 07:33:04 · answer #8 · answered by Ruthinia 6 · 0⤊ 0⤋
If I had a dog that ugly, I'd comb his face and teach him to walk backwards.
2006-06-29 07:32:11 · answer #9 · answered by Cowboy Cartoonist 2 · 0⤊ 0⤋
for easy discharge of waste and easy penetration for those confused noes who use it for intercourse
2006-06-29 07:32:02 · answer #10 · answered by Anonymous · 0⤊ 0⤋