when I was 6 year old , I used to love sitting in the car on the backside with open door. Then oneday I fall from a small bridge on paddy fields. I was not injured. But since then I am not enthusiastic about sitting in the similar positions.
In animal kingdom up to Cephlochordata(or Acrania) spinal cord is not present but from Vertebrata(or Craniata) spinal cord present that mean if we go developed animal after Vertebrata all have spine.
Like Vertebrata has divided into two super class i)Agnatha ii) Gnathostomata
and in this Gnathostomata super-class Fish,Amphibia,Reptilia ,Aves, Mammalia all belongs so all have spine.
what ES is saying is that
fishes, amphibians, reptiles, birds and mammals have spines.
protozoa, bacteria, worms, insects, arachnids ec have no spine
look what have I found....
So the Lord God said to the serpent:
"Because you have done this,
You are cursed more than all cattle,
And more than every beast of the field;
On your belly you shall go,
And you shall eat dust
All the days of your life.
And I will put enmity
Between you and the woman,
And between your seed and her Seed;
He shall bruise your head,
And you shall bruise His heel."
--The Holy Bible, New King James Version, Genesis 3:14-3:15
Last edited by nandini; 07-17-09 at 02:58 PM. Reason: Automerged Doublepost
you are welcome nandini
DTIS
OK, since we are clear now, Nandini could you please go back to this post
http://www.indiabroadband.net/entert...tml#post195476 (living on the edge...)
and change
to
Little more
Actually Chordata has divided into four sub part Hemichordata Urochordata, Cephalochordata and Vertebrata
Among four only Vertebrata has spine.
Now why ?
Because in chordata class animal we find two type of organ one called i)Notochord ii) Nerve cord
this notochord has developed into spine due to evolution
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