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OpenStudy (anonymous):
The first arthropods thought to exist are called the _______. A. arachnids B. chitin C. nymphs D. trilobites
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OpenStudy (anonymous):
@musa19965 what you think???
OpenStudy (anonymous):
I think it is Trilobites
OpenStudy (anonymous):
I think its B
OpenStudy (anonymous):
its not B because Chitin is a tough, protective, semitransparent substance, primarily a nitrogen-containing polysaccharide, forming the principal component of arthropod exoskeletons and the cell walls of certain fungi.
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OpenStudy (anonymous):
oh
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