What characteristics have made arthropods the most successful ...

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What characteristics have made arthropods the most successful phylum? How these animals grow? Can you think of any disadvantage of growing this way?

Question 2

Periodic uplift or wave-cut platforms result in ____.
 A) river valleys known as fjords
  B) protruding shorelines termed headlands
  C) stair-step formations called marine terraces
  D) crescent-shaped shoreline called bays

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Answer to Question 1

 Arthropods are segmented, but not in the same way as annelids. They have clear segments have a pair of appendages attached. These appendages have articulation that was a successful evolutionary adaptation for arthropods. They are able to move and bend at specific joints on the animal. Each joint allows a full range of motion.
 Arthropods have an exoskeleton. This is a strong, lightweight outer covering made of chitin. An exoskeleton is form-fitting and moves with the animals.
 Arthropods developed lightweight striated muscles. This makes rapid movement possible.
 An arthropod grows by molting. The exoskeleton is shed at regular intervals. Once it is shed, the arthropod expands its tissues with water and grows a new shell.

Answer to Question 2

C

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Gracias!

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