2006-08-03 08:10:25 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Mollusk do not have segmentation. Worm (annelida) have, insects and crusteceans (arthropods) do, and chordata (those with vertebraes: fish, reptiles, mamals) are considered to be segmented, although it is quite discrete now, after millions of years of evolution.
2006-08-03 08:23:34 · answer #1 · answered by Vincent G 7 · 0⤊ 0⤋
Mollusca are not segmented, though the primitive
Neopilina is sometimes said to be so. The kind of
segmentation in annelids, arthropods and chordates is different in each case, and also is
different from the situation in Neopilina. Oddly
enough there does not seem to be a generally
agreed on definition of what constitutes segmentation. Different biologists have different
ideas. Metamerism, for instance, is a specific
defined form of segmentation, but it does not
apply to some groups that are segmented.
2006-08-03 16:50:24 · answer #2 · answered by Anonymous · 0⤊ 0⤋
C. Mollusca is the answer you want.
Chordates aren't really segmented, but a case could be made that the spinal cord appears to have segments.
2006-08-03 16:01:29 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Mollusca is the answer (C).
Annelida are the segmented worms (dead giveaway).
Arthropods and Chrodates are also segmented.
2006-08-03 16:49:54 · answer #4 · answered by icehoundxx 6 · 0⤊ 0⤋
d:chordata: not segmented:
Annelids : ; segmented
arthropoda::segmented.
mollusca:segmented
2006-08-04 06:07:42 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Is this a pop quiz? I haven't studied!
Neither have you, apparently.
2006-08-03 15:20:01 · answer #6 · answered by Zhimbo 4 · 0⤊ 0⤋
annelids
2006-08-03 15:36:58 · answer #7 · answered by some♥chick 3 · 0⤊ 0⤋