A.
a digestive system
B.
a nervous system
C.
a respiratory system
D.
a reproductive system
2007-03-12 21:51:13 · 5 answers · asked by live~laugh~love 1 in Science & Mathematics ➔ Biology
C a respiratory system. Flatworms do not include earthworms, they contain the Planarian, tapeworm and flukes.
They contain rudimentary organ systems such as: a ladder-like nervous system with a small brain and in some cases photosensitive eye spots. A network of flame cells used to sweep nitrogenous waste out of the body. A primitive digestive system consisting of a mouth, pharynx and branched gastrovascular cavity.
Flatworms exhibit two forms of life styles, free-living and parasitic.
The phylum contain 3 classes: Trematoda ( parasitic flukes), Cestoda ( parasitic tapeworms ), and Turbellaria ( free living Planaria ).
They can reproduce asexually ( regeneration ) or sexually (hermaphroditic).
The parasites exhibit a complex life cycle usually involving several intermediate hosts.
2007-03-13 01:59:20 · answer #1 · answered by ATP-Man 7 · 2⤊ 0⤋
C. Respiratory System
2007-03-12 21:55:45 · answer #2 · answered by bigjap2001 2 · 0⤊ 1⤋
All of them. Earthworms do not have modified organ systems. They have few organs which carry out those functions, though.
For instance, spiracles as holes for breathing.
2007-03-12 23:30:48 · answer #3 · answered by TrueWOW 3 · 0⤊ 1⤋
D... Im taking a reasonable guess. If you're doing homework, dont use this answer
2007-03-12 21:54:45 · answer #4 · answered by Sumguy 1 · 1⤊ 1⤋
DJB is definetly right.
Answer:D
2007-03-13 09:50:20 · answer #5 · answered by z1 2 · 0⤊ 0⤋