Monday, May 13, 2013

Marine Arthropods

1. What are examples of marine arthropods?
  There are crustacea, Pycnogonida also called "sea spiders," and Merostomata also called "horseshoe crabs."

2. What's the difference between an arthropods skeleton and a human's?
  An arthropod's skeleton is on the outside and it protects them. The muscles of an arthropod are connected to the inside of the exoskeleton.

3. Compare/Contrast how arthropod's and humans move blood in their circulatory systems.
  Arthropods have an open circulatory system, which means they have no arteries, veins or capillaries to carry blood. Instead, blood is pumped through sinuses within the animal to reach the tissues.

4. How do the eyes of arthropods differ from your eyes?
  Arthropods have compound eyes. Each eye is composed of many smaller light-sensitive organs, called ommatidia. Together they form a single working eye.

5. How do humans use marine arthropods?
   We eat marine arthropods.


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