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-   -   Honey, help me organsm?Self-Adapter (http://www.physicsforums.com/showthread.php?t=35372)

Carter Jul16-04 12:28 PM

Honey, help me organsm?Self-Adapter
 
im wanting to study biology but stuck, im wondering if there is an organsim or an animal which has a mouth, a stomach but wituot a brain. Do this animal exist ? how old it is now ?
If it has no brain, pliz you tell me how it probes and feels the preys, how it makes love to have kids and gandkids ? afaik, brain also plays importent role in reproduction, right ?
btw, pliz dun forget to include infor about its self-adaptation 2. How doz it adapt to inviromento ?

Thanx :wink: ***

Carter Jul16-04 12:32 PM

You no any biology books for newbies ?

iansmith Jul16-04 12:55 PM

the animal represent your description are the sea sponge (cnidaria), sea anemones and relative (porifera). Most of the animals with the exception of the jellyfish and medusa, are "pump and filter" organism. Water come in and nutirents are trap. Jelly fish and medusa have sensory cells. Read the link at the botom and you will learn more.

http://www.ucmp.berkeley.edu/cnidaria/cnidaria.html
http://www.ucmp.berkeley.edu/porifera/porifera.html
http://www.ucihs.uci.edu/biochem/steele/anthozoa.html
http://www.emc.maricopa.edu/faculty/...versity_7.html
http://www.emc.maricopa.edu/faculty/...BK/anemone.gif

loseyourname Jul17-04 09:46 PM

1 Attachment(s)
Been a while since zoology, Ian? Sea sponges are porifera, anemones and jellies are cnidaria. Sponges don't have any closed body cavities, either, so I don't know if you could say they have a stomach. What I think you are referring to as the mouth and stomach are actually the osculum and spongocoel. Cnidarians are the simplest animal to possess a gastrovascular cavity, which I suppose you can consider a stomach, although it also serves as a hydrostatic skeleton and circulatory system.

Here's a diagram of a sponge:

iansmith Jul17-04 10:20 PM

Quote:

Quote by loseyourname
Been a while since zoology, Ian? Sea sponges are porifera, anemones and jellies are cnidaria.

I didn't proof read my post.

Quote:

Quote by loseyourname
What I think you are referring to as the mouth and stomach are actually the osculum and spongocoel. Cnidarians are the simplest animal to possess a gastrovascular cavity, which I suppose you can consider a stomach, although it also serves as a hydrostatic skeleton and circulatory system.

Bio prof was kind hinting that the osculum and spongocoel could be consider some sort of intestine rather than a stomach since, in a nut shell, intestine absorb and stomach digest.


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