As the arthropod ancestors underwent "arthropodization,"
A) their circulatory system became closed.
B) their hemocoel took on a new function as a hydrostatic skeleton.
C) there was an expansion of surfaces for respiration and excretion.
D) the cuticle was hardened to form a stiffened exoskeleton.
Correct Answer:
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Q20: Crustaceans are primarily freshwater animals,but there are
Q21: Scorpions
A)feed during the day.
B)are most common in
Q22: Crustaceans
A)breathe by means of tracheae.
B)excrete by means
Q23: Ecdysis (molting)in crustaceans
A)involves production of a new
Q24: The crustaceans that are sessile and enclosed
Q26: Spiders
A)feed on plant juices.
B)have six legs.
C)have chelicerae
Q27: The Acari
A)have a distinct head,thorax,and abdomen.
B)are of
Q28: The flight muscles of many species of
Q29: The class Insecta
A)has more species than any
Q30: Some examples of branchiopod crustaceans are the
A)water
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