14. Describe or draw/label what is inside the fleshy lobe of a sarcopterygian fish. 15. What single...

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Biology

14. Describe or draw/label what is inside the fleshy lobe of asarcopterygian fish.
15. What single characteristic of the Arthropoda appears toaccount for their success, diversity and abundance?
16. How many times did chitin evolve?

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15 The success of thearthropods can mainly be attributed to the presence of exoskeletonwhich makes them versatile is protective in nature and also allowsflexibility and mobility You can see arthropods living on land andin water16 The distribution and evolutionary history of chitinsynthases was studied most extensively in fungi It was shown thatmost of fungi have not one but several different chitin synthasegenes per genome According to phylogenetic analysis and studies ofdomain structure Roncero 2002 RuizHerrera and RuizMedrano2004 fungal chitin synthases form seven monophyletic classeswhich in turn form two divisions These classes do not corresponddirectly to organismal phylogeny any given fungal genome See Answer

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