Compare and contrast the three phyla of worms. Which is considered to be the most evolutionarily
advanced? What will be an ideal response?
ANS:Answer
should include:
? Platyhelminthes are the flatworms. They are the simplest kind of worm. Some are
parasitic, but most are free-living predators and scavengers. Flatworms are the first
organism to have a primitive central nervous system. They also have small eyespots
instead of a complex eye. Flatworms exchange gases through its skin because it lacks a
true respiratory or excretory system.
? Nematodes are roundworms. They are the first worm to develop a digestive system.
These worms are considered the most successful due to their representation in a variety
of environments. They are especially successful in sediments. Most of these worms are
free-living and microscopic.
? Annelids are segmented worms with a number of divisions. It allows for growth in the
worm to occur in evenly spaced segments. Each segment contains its own circulatory,
excretory, nervous, muscular, and reproductive system.
? Annelids are considered to be the most evolutionarily advanced worm.
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Fill in the blank(s) with the appropriate word(s).
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Fill in the blank(s) with correct word