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Author Question: Polychaetes are the most successful worm phyla, being found in terrestrial, aquatic, and marine ... (Read 67 times)

K@

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on: Aug 22, 2018

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



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gstein359

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Reply #1 on: Aug 22, 2018
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@

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Reply 2 on: Aug 22, 2018
Thanks for the timely response, appreciate it

komodo7

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Reply 3 on: Yesterday
Wow, this really help

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