What is a difference between exoskeletons and endoskeletons?
a. an exoskeleton is rigid, and an endoskeleton is flexible
b. endoskeleton are only found in vertebrates
c. exoskeletons are composed of calcium, and endoskeletons are composedd of chitin
d. exoskeletons are external to the soft tissues, and endoskeletons are internal
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What is a difference between exoskeletons and endoskeletons?
a. an exoskeleton is rigid, and...
a. an exoskeleton is rigid, and...
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