The traits that are unique to insects and have probably contributed to their diversity and success include
A) the presence of four or more pairs of legs,an exoskeleton,and a water- resistant cuticle.
B) the exoskeleton,an open circulatory system,and jointed appendages.
C) small body size,an exoskeleton,and sexual reproduction.
D) flight,short generation times,and complex life cycles including complete metamorphosis.
Correct Answer:
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