Polychaetes are the most successful worm phyla, being found in ...

[K@]

Polychaetes are the most successful worm phyla, being found in terrestrial, aquatic, and marine
  environments. Indicate whether the statement is true or false.

Question 2

What comprises an arthropod's exoskeleton?
  a. Keratin
  b. Spicules
  c. Chitin
  d. Bone

[gstein359]

Answer to Question 1

ANS: F
Nematodes are considered the most successful phylum of the worms. Most roundworms are free-living
and microscopic. Information can be found in the section The Worm Phyla Are the Link to Advanced
Animals.

Answer to Question 2

ANS: C
An exoskeleton is a strong yet lightweight external covering. It provides support and protection to
arthropods. Chitin is a nitrogen-rich carbohydrate that is strengthened by calcium carbonate.
Information can be found in the section Advanced Invertebrates Have Complex Bodies and Internal
Systems.

[K@]

Great answer, keep it coming

[mcarey591]

Thanks for the timely response, appreciate it