In essay form and at least 300 word Scientific content (accuracy; fact-supported; clarity; relevancy; paraphrased, i.e. no quotations). there has to be 6 or more in-text citations.

What is the exoskeleton of an organism in the Phylum Arthropoda composed of? Is a horseshoe crab more closely related to a crab or a spider?

Which Phylum contains organisms which need to molt their exoskeleton?