Sponges are autotrophs.
Sponges lack a true body cavity.
Sponges exhibit radial symmetry.
Sponges lack true tissues.
Sponges have a true coelom.
2007-07-29 06:53:21 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Sponges lack a tissue grade of organization.
They have a canal system( ascon, sycon, and leucon type).
They have choanocytes, flagellated cells.
They lack body cavity.
Embryonic development has a different pattern. There is so called exograstrulation. The flagellated cells are become external. The cells which in the gastrula of higher animals should be internal become external and therefore, they are not called true metazoans, and have been placed in a separate group called parazoa.
2007-08-02 02:43:21 · answer #1 · answered by Ishan26 7 · 0⤊ 0⤋
they are the only creatures which posses a water vascular system, they are also the first and simplest multicellular animals made up of only cell aggregrates, they are autotrophs lackin coelom n true tissues, n they have absolutely no nervous system or reproductive system, digestion is intracellular....
2007-07-29 07:13:25 · answer #2 · answered by pahini5 2 · 0⤊ 0⤋
Sponges help us wash our dishes and animals don't
2015-07-07 08:44:38 · answer #3 · answered by Martin 1 · 0⤊ 0⤋
If they did not live in the sea, then sea levels would be at least three meters higher. FACT!
2007-07-29 06:56:41 · answer #4 · answered by Superdog 7 · 0⤊ 0⤋
sponges lack true tissues, they are parazoans
2007-07-29 07:22:42 · answer #5 · answered by audiophile 2 · 0⤊ 0⤋