The word you're looking for is Exoskeleton. The outer covering is called an EXOSKELETON which is a hard covering on the outside of the body that provides both support and protection. The exoskeleton is made of CHITIN. Some exoskeletons are leathery like caterpillars, and some are tough and hard like ticks and crabs.
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Based only on the DNA, which populations do you think live in closer proximity to each other? What do you expect to see when comparing genes of lions that live closer together?
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The methods for removal of phosphate and nitrate involve the usage of polymer hydrogels and crystallization process using coal fly ash.
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I looked this up, the question is very vague, so I can't be sure if this answers your question.
